Ecology (from Ancient Greek  οἶκος (oîkos)  'house' and  -λογία (-logía)  'study of') is the natural science of the relationships among living organisms and their environment. Ecology considers organisms at the individual, population, community, ecosystem, and biosphere levels. Ecology overlaps with the closely related sciences of biogeography, evolutionary biology, genetics, ethology, and natural history.
Ecology is a branch of biology, and is the study of abundance, biomass, and distribution of organisms in the context of the environment. It encompasses life processes, interactions, and adaptations; movement of materials and energy through living communities; successional development of ecosystems; cooperation, competition, and predation within and between species; and patterns of biodiversity and its effect on ecosystem processes.
Ecology has practical applications in fields such as conservation biology, wetland management, natural resource management, and human ecology.
The term ecology (German: Ökologie) was coined in 1866 by the German scientist Ernst Haeckel. The science of ecology as it is known today began with a group of American botanists in the 1890s. Evolutionary concepts relating to adaptation and natural selection are cornerstones of modern ecological theory.
Ecosystems are dynamically interacting systems of organisms, the communities they make up, and the non-living (abiotic) components of their environment. Ecosystem processes, such as primary production, nutrient cycling, and niche construction, regulate the flux of energy and matter through an environment. Ecosystems have biophysical feedback mechanisms that moderate processes acting on living (biotic) and abiotic components of the planet. Ecosystems sustain life-supporting functions and provide ecosystem services such as biomass production (food, fuel, fiber, and medicine), the regulation of climate, global biogeochemical cycles, water filtration, soil formation, erosion control, flood protection, and many other natural features of scientific, historical, economic, or intrinsic value.

== Levels, scope, and scale of organization ==

Ecosystems vary from tiny to vast. A single tree is of little consequence to the classification of a forest ecosystem, but is critically relevant to organisms living in and on it. Several generations of an aphid population can exist over the lifespan of a single leaf. Each of those aphids, in turn, supports diverse bacterial communities. The nature of connections in ecological communities cannot be explained by knowing the details of each species in isolation, because the emergent pattern is neither revealed nor predicted until the ecosystem is studied as an integrated whole.
The main subdisciplines of ecology, population (or community) ecology and ecosystem ecology, differ in their contrasting paradigms. The former focuses on organisms' distribution and abundance, while the latter focuses on materials and energy fluxes.

=== Hierarchy ===

To structure the study of ecology into a conceptually manageable framework, the biological world is organized into a hierarchy, ranging in scale from (as far as ecology is concerned) organisms, to populations, to guilds, to communities, to ecosystems, to biomes, and up to the level of the biosphere. This framework forms a panarchy and exhibits non-linear behaviors; this means that "effect and cause are disproportionate, so that small changes to critical variables, such as the number of nitrogen fixers, can lead to disproportionate, perhaps irreversible, changes in the system properties."

=== Biodiversity ===

Biodiversity (an abbreviation of "biological diversity") describes the diversity of life from genes to ecosystems and spans every level of biological organization. The term has several interpretations, and there are many ways to index, measure, characterize, and represent its complex organization. Biodiversity includes species diversity, ecosystem diversity, and genetic diversity and scientists are interested in the way that this diversity affects the complex ecological processes operating at and among these respective levels.
Biodiversity plays an important role in ecosystem services which by definition maintain and improve human quality of life. It delivers ecosystem services across heterogeneous real-world landscapes, influenced by human management and environmental conditions.
Conservation priorities and management techniques require different approaches and considerations to address the full ecological scope of biodiversity. Natural capital that supports populations is critical for maintaining ecosystem services and species migration (e.g., riverine fish runs and avian insect control) has been implicated as one mechanism by which those service losses are experienced. An understanding of biodiversity has practical applications for species and ecosystem-level conservation planners as they make management recommendations to consulting firms, governments, and industry.

=== Habitat ===

The habitat of a species describes the environment over which it occurs and the type of community that is formed. More specifically, "habitats can be defined as regions in environmental space that are composed of multiple dimensions, each representing a biotic or abiotic environmental variable; that is, any component or characteristic of the environment related directly (e.g. forage biomass and quality) or indirectly (e.g. elevation) to the use of a location by the animal."

=== Niche ===

Definitions of niche date back to 1917. In 1957, G. Evelyn Hutchinson introduced "the set of biotic and abiotic conditions in which a species is able to persist and maintain stable population sizes." The niche is a central concept in the ecology of organisms and is sub-divided into fundamental and realized niches. The fundamental niche is the set of environmental conditions under which a species is able to persist. The realized niche is the set of environmental plus ecological conditions under which a species persists. The Hutchinsonian niche is defined more technically as a "Euclidean hyperspace whose dimensions are defined as environmental variables and whose size is a function of the number of values that the environmental values may assume for which an organism has positive fitness."

=== Niche construction ===

Organisms are subject to environmental pressures, but they also modify their habitats. The regulatory feedback between organisms and their environment can affect conditions from local (e.g., a beaver pond) to global scales, over time and even after death, such as decaying logs or silica skeleton deposits from marine organisms. Ecosystem engineering is related to niche construction, but the former relates only to the physical modifications of the habitat whereas the latter also considers the evolutionary implications of physical changes to the environment and feedback on natural selection. Ecosystem engineers are defined as: "organisms that directly or indirectly modulate the availability of resources to other species, by causing physical state changes in biotic or abiotic materials. In so doing they modify, maintain and create habitats."

=== Biome ===

Biomes are larger units of organization that categorize regions of the Earth's ecosystems, mainly according to the structure and composition of vegetation. There are different methods to define the continental boundaries of biomes dominated by different functional types of vegetative communities that are limited in distribution by climate, precipitation, weather, and other environmental variables. Biomes include tropical rainforest, temperate broadleaf and mixed forest, temperate deciduous forest, taiga, tundra, hot desert, and polar desert. Other researchers have recently categorized other biomes, such as the human and oceanic microbiomes. To a microbe, the human body is a habitat and a landscape. Microbiomes were discovered largely through advances in molecular genetic


Climate is the long-term weather pattern in a region, typically averaged over 30 years. More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years. Some of the meteorological variables that are commonly measured are temperature, humidity, atmospheric pressure, wind, and precipitation. In a broader sense, climate is the state of the components of the climate system, including the atmosphere, hydrosphere, cryosphere, lithosphere and biosphere and the interactions between them. The climate of a location is affected by its latitude, longitude, terrain, altitude, land use and nearby water bodies and their currents.
Climates can be classified according to the average and typical variables, most commonly temperature and precipitation. The most widely used classification scheme is the Köppen climate classification. The Thornthwaite system, in use since 1948, incorporates evapotranspiration along with temperature and precipitation information and is used in studying biological diversity and how climate change affects it. The major classifications in Thornthwaite's climate classification are microthermal, mesothermal, and megathermal. Finally, the Bergeron and Spatial Synoptic Classification systems focus on the origin of air masses that define the climate of a region.
Paleoclimatology is the study of ancient climates. Paleoclimatologists seek to explain climate variations for all parts of the Earth during any given geologic period, beginning with the time of the Earth's formation. Since very few direct observations of climate were available before the 19th century, paleoclimates are inferred from proxy variables. They include non-biotic evidence—such as sediments found in lake beds and ice cores—and biotic evidence—such as tree rings and coral. Climate models are mathematical models of past, present, and future climates. Climate change may occur over long and short timescales due to various factors. Recent warming is discussed in terms of global warming, which results in redistributions of biota. For example, as climate scientist Lesley Ann Hughes has written: "a 3 °C [5 °F] change in mean annual temperature corresponds to a shift in isotherms of approximately 300–400 km [190–250 mi] in latitude (in the temperate zone) or 500 m [1,600 ft] in elevation. Therefore, species are expected to move upwards in elevation or towards the poles in latitude in response to shifting climate zones."

== Definition ==
Climate (from Ancient Greek  κλίμα 'inclination') is commonly defined as the weather averaged over a long period. The standard averaging period is 30 years, but other periods may be used depending on the purpose. Climate also includes statistics other than the average, such as the magnitudes of day-to-day or year-to-year variations. The Intergovernmental Panel on Climate Change (IPCC) 2001 glossary definition is as follows:

"Climate in a narrow sense is usually defined as the "average weather", or more rigorously, as the statistical description in terms of the mean and variability of relevant quantities over a period ranging from months to thousands or millions of years. The classical period is 30 years, as defined by the World Meteorological Organization (WMO). These quantities are most often surface variables such as temperature, precipitation, and wind. Climate in a wider sense is the state, including a statistical description, of the climate system."
The World Meteorological Organization (WMO) describes "climate normals" as "reference points used by climatologists to compare current climatological trends to that of the past or what is considered typical. A climate normal is defined as the arithmetic average of a climate element (e.g. temperature) over a 30-year period. A 30-year period is used as it is long enough to filter out any interannual variation or anomalies such as El Niño–Southern Oscillation, but also short enough to be able to show longer climatic trends."
The WMO originated from the International Meteorological Organization which set up a technical commission for climatology in 1929. At its 1934 Wiesbaden meeting, the technical commission designated the thirty-year period from 1901 to 1930 as the reference time frame for climatological standard normals. In 1982, the WMO agreed to update climate normals, and these were subsequently completed on the basis of climate data from 1 January 1961 to 31 December 1990. The 1961–1990 climate normals serve as the baseline reference period. The next set of climate normals to be published by WMO is from 1991 to 2020. Aside from collecting from the most common atmospheric variables (air temperature, pressure, precipitation and wind), other variables such as humidity, visibility, cloud amount, solar radiation, soil temperature, pan evaporation rate, days with thunder and days with hail are also collected to measure change in climate conditions.
The difference between climate and weather is usefully summarized by the popular phrase "Climate is what you expect, weather is what you get." Over historical time spans, there are a number of nearly constant variables that determine climate, including latitude, altitude, proportion of land to water, and proximity to oceans and mountains. All of these variables change only over periods of millions of years due to processes such as plate tectonics. Other climate determinants are more dynamic: the thermohaline circulation of the ocean leads to a 5 °C (9 °F) warming of the northern Atlantic Ocean compared to other ocean basins. Other ocean currents redistribute heat between land and water on a more regional scale. The density and type of vegetation coverage affects solar heat absorption, water retention, and rainfall on a regional level. Alterations in the quantity of atmospheric greenhouse gases (particularly carbon dioxide and methane) determines the amount of solar energy retained by the planet, leading to global warming or global cooling. The variables which determine climate are numerous and the interactions complex, but there is general agreement that the broad outlines are understood, at least insofar as the determinants of historical climate change are concerned.

== Climate classification ==

Climate classifications are systems that categorize the world's climates. A climate classification may correlate closely with a biome classification, as climate is a major influence on life in a region. One of the most used is the Köppen climate classification scheme first developed in 1899.
There are several ways to classify climates into similar regimes. Originally, climes were defined in Ancient Greece to describe the weather depending upon a location's latitude. Modern climate classification methods can be broadly divided into genetic methods, which focus on the causes of climate, and empiric methods, which focus on the effects of climate. Examples of genetic classification include methods based on the relative frequency of different air mass types or locations within synoptic weather disturbances. Examples of empiric classifications include climate zones defined by plant hardiness, evapotranspiration, or more generally the Köppen climate classification which was originally designed to identify the climates associated with certain biomes. A common shortcoming of these classification schemes is that they produce distinct boundaries between the zones they define, rather than the gradual transition of climate properties more common in nature.

== Record ==

=== Paleoclimatology ===

Paleoclimatology is the study of past climate over a great period of the Earth's history. It uses evidence with different time scales (from decades to millennia) from ice sheets, tree rings, sediments, pollen, coral, and rocks to determine the past state of the climate. It demonstrates periods of stability and periods of change and can indicate whether changes follow patterns such as regular cycles.

=== Modern ===

Det


Language is a structured system of communication that consists of grammar and vocabulary. It is the primary means by which humans convey meaning, both in spoken and signed forms, and may also be conveyed through writing. Human language is characterized by its cultural and historical diversity, with significant variations observed between cultures and across time. Human languages possess the properties of productivity and displacement, which enable the creation of an infinite number of sentences, and the ability to refer to objects, events, and ideas that are not immediately present in the discourse. The use of human language relies on social convention and is acquired through learning.
Estimates of the number of human languages in the world vary between 5,000 and 7,000. Precise estimates depend on an arbitrary distinction (dichotomy) established between languages and dialects. Natural languages are spoken, signed, or both; however, any language can be encoded into secondary media using auditory, visual, or tactile stimuli – for example, writing, whistling, signing, or braille. In other words, human language is modality-independent, but written or signed language is the way to inscribe or encode the natural human speech or gestures.
Depending on philosophical perspectives regarding the definition of language and meaning, when used as a general concept, "language" may refer to the cognitive ability to learn and use systems of complex communication, or to describe the set of rules that makes up these systems, or the set of utterances that can be produced from those rules. All languages rely on the process of semiosis to relate signs to particular meanings. Oral, manual and tactile languages contain a phonological system that governs how symbols are used to form sequences known as words or morphemes, and a syntactic system that governs how words and morphemes are combined to form phrases and utterances.
The scientific study of language is called linguistics. Critical examinations of languages, such as philosophy of language, the relationships between language and thought, how words represent experience, etc., have been debated at least since Gorgias and Plato in ancient Greek civilization. Thinkers such as Jean-Jacques Rousseau (1712–1778) have argued that language originated from emotions, while others like Immanuel Kant (1724–1804) have argued that languages originated from rational and logical thought. Twentieth century philosophers such as Ludwig Wittgenstein (1889–1951) argued that philosophy is really the study of language itself. Major figures in contemporary linguistics include Ferdinand de Saussure and Noam Chomsky.
Language is thought to have gradually diverged from earlier primate communication systems when early hominins acquired the ability to form a theory of mind and shared intentionality. This development is sometimes thought to have coincided with an increase in brain volume, and many linguists see the structures of language as having evolved to serve specific communicative and social functions. Language is processed in many different locations in the human brain, but especially in Broca's and Wernicke's areas. Humans acquire language through social interaction in early childhood, and children generally speak fluently by approximately three years old. Language and culture are codependent. Therefore, in addition to its strictly communicative uses, language has social uses such as signifying group identity, social stratification, as well as use for social grooming and entertainment.
Languages evolve and diversify over time, and the history of their evolution can be reconstructed by comparing modern languages to determine which traits their ancestral languages must have had in order for the later developmental stages to occur. A group of languages that descend from a common ancestor is known as a language family; in contrast, a language that has been demonstrated not to have any living or non-living relationship with another language is called a language isolate. There are also many unclassified languages whose relationships have not been established, and spurious languages may have not existed at all. Academic consensus holds that between 50% and 90% of languages spoken at the beginning of the 21st century will probably have become extinct by the year 2100.

== Definitions ==

The English word language derives ultimately from Proto-Indo-European *dn̥ǵʰwéh₂s "tongue, speech, language" through Latin lingua, "language; tongue", and Old French language. The word is sometimes used to refer to codes, ciphers, and other kinds of artificially constructed communication systems such as formally defined computer languages used for computer programming. Unlike conventional human languages, a formal language in this sense is a system of signs for encoding and decoding information. This article specifically concerns the properties of natural human language as it is studied in the discipline of linguistics.
As an object of linguistic study, "language" has two primary meanings: an abstract concept, and a specific linguistic system, e.g. "French". The Swiss linguist Ferdinand de Saussure, who defined the modern discipline of linguistics, first explicitly formulated the distinction using the French word langage for language as a concept, langue as a specific instance of a language system, and parole for the concrete use of speech in a particular language.
When speaking of language as a general concept, definitions can be used which stress different aspects of the phenomenon. These definitions also entail different approaches and understandings of language, and they also inform different and often incompatible schools of linguistic theory. Debates about the nature and origin of language go back to the ancient world. Greek philosophers such as Gorgias and Plato debated the relation between words, concepts and reality. Gorgias argued that language could represent neither the objective experience nor human experience, and that communication and truth were therefore impossible. Plato maintained that communication is possible because language represents ideas and concepts that exist independently of, and prior to, language.
During the Enlightenment and its debates about human origins, it became fashionable to speculate about the origin of language. Thinkers such as Rousseau and Johann Gottfried Herder argued that language had originated in the instinctive expression of emotions, and that it was originally closer to music and poetry than to the logical expression of rational thought. Rationalist philosophers such as Kant and René Descartes held the opposite view. Around the turn of the 20th century, thinkers began to wonder about the role of language in shaping our experiences of the world – asking whether language simply reflects the objective structure of the world, or whether it creates concepts that in turn impose structure on our experience of the objective world. This led to the question of whether philosophical problems are really firstly linguistic problems. The resurgence of the view that language plays a significant role in the creation and circulation of concepts, and that the study of philosophy is essentially the study of language, is associated with what has been called the linguistic turn and philosophers such as Wittgenstein in 20th-century philosophy. These debates about language in relation to meaning and reference, cognition and consciousness remain active today.

=== Mental faculty, organ or instinct ===
One definition sees language primarily as the mental faculty that allows humans to undertake linguistic behaviour: to learn languages and to produce and understand utterances. This definition stresses the universality of language to all humans, and it emphasizes the biological basis for the human capacity for language as a unique development of the human brain. Proponents of the view that the drive to language acquisition is innate in human


An alphabet is a writing system that uses a standard set of symbols, called letters, to more or less represent particular sounds in a spoken language. Specifically, letters largely correspond to phonemes as the smallest sound segments that can distinguish one word from another in a given language. Not all writing systems represent language in this way: a syllabary assigns symbols to spoken syllables, while logographies assign symbols to words, morphemes, or other semantic units.
The first letters were invented in Ancient Egypt to serve as an aid in writing Egyptian hieroglyphs; these are referred to as Egyptian uniliteral signs by lexicographers. This system was used until the 5th century AD, and fundamentally differed by adding pronunciation hints to existing hieroglyphs that had previously carried no pronunciation information. Later on, these phonemic symbols were used to transcribe foreign words. The first fully phonemic script was the Proto-Sinaitic script, also descending from Egyptian hieroglyphs, which was later modified to create the Phoenician alphabet. The Phoenician system is considered the first true alphabet and is the ultimate ancestor of many modern scripts, including Arabic, Cyrillic, Greek, Hebrew, Latin, and possibly Brahmic.

Peter T. Daniels distinguishes true alphabets—which use letters to represent both consonants and vowels—from both abugidas and abjads, which only need letters for consonants. Abugidas represent them with diacritics added to letters, while abjads generally lack vowel indicators altogether. In this narrower sense, the Greek alphabet was the first true alphabet; it was originally derived from the Phoenician alphabet, which was an abjad.
Alphabets usually have a standard ordering for their letters. This makes alphabets a useful tool in collation, as words can be listed in a well-defined order—commonly known as alphabetical order. This also means that letters may be used as a method of "numbering" ordered items. Some systems demonstrate acrophony, a phenomenon where letters have been given names distinct from their pronunciations. Systems with acrophony include Greek, Arabic, Hebrew, and Syriac; systems without include the Latin alphabet.

== Etymology ==
The English word alphabet came into Middle English from the Late Latin word alphabetum, which in turn originated in the Greek ἀλφάβητος alphábētos; it was made from the first two letters of the Greek alphabet, alpha (α) and beta (β). The names for the Greek letters, in turn, came from the first two letters of the Phoenician alphabet: aleph, the word for ox, and bet, the word for house.

== History ==

=== Alphabets related to Phoenician ===

==== Ancient Near Eastern alphabets ====
The Ancient Egyptian writing system had a set of some 24 hieroglyphs that are called uniliterals, which are glyphs that provide one sound. These glyphs were used as pronunciation guides for logograms, to write grammatical inflections, and, later, to transcribe loan words and foreign names. The script was used a fair amount in the 4th century AD. However, after pagan temples were closed down, it was forgotten in the 5th century until the discovery of the Rosetta Stone. There was also cuneiform, primarily used to write several ancient languages, including Sumerian. The last known use of cuneiform was in 75 AD, after which the script fell out of use.
In the Middle Bronze Age, an apparently alphabetic system known as the Proto-Sinaitic script appeared in Egyptian turquoise mines in the Sinai Peninsula c. 1840 BC, apparently left by Canaanite workers. Orly Goldwasser has connected the illiterate turquoise miner graffiti theory to the origin of the alphabet. In 1999, American Egyptologists John and Deborah Darnell discovered an earlier version of this first alphabet at the Wadi el-Hol valley. The script dated to c. 1800 BC and shows evidence of having been adapted from specific forms of Egyptian hieroglyphs that could be dated to c. 2000 BC, strongly suggesting that the first alphabet had developed about that time. The script was based on letter appearances and names, believed to be based on Egyptian hieroglyphs. This script had no characters representing vowels. Originally, it probably was a syllabary—a script where syllables are represented with characters—with symbols that were not needed being removed. The best-attested Bronze Age alphabet is Ugaritic, invented in Ugarit before the 15th century BC. This was an alphabetic cuneiform script with 30 signs, including three that indicate the following vowel. This script was not used after the destruction of Ugarit in 1178 BC.

The Proto-Sinaitic script eventually developed into the Phoenician alphabet, conventionally called Proto-Canaanite, before c. 1050 BC. The oldest text in Phoenician script is an inscription on the sarcophagus of King Ahiram c. 1000 BC. This script is the parent script of all western alphabets. By the 10th century BC, two other forms distinguish themselves, Canaanite and Aramaic. The Aramaic gave rise to the Hebrew alphabet.
The South Arabian alphabet, a sister script to the Phoenician alphabet, is the script from which the Geʽez script was descended. Abugidas are writing systems with characters comprising consonant–vowel sequences. Alphabets without obligatory vowels are called abjads, with examples being Arabic, Hebrew, and Syriac. The omission of vowels was not always a satisfactory solution due to the need of preserving sacred texts. "Weak" consonants are used to indicate vowels. These letters have a dual function since they can also be used as pure consonants.
The Proto-Sinaitic script and the Ugaritic script were the first scripts with a limited number of signs instead of using many different signs for words, in contrast to cuneiform, Egyptian hieroglyphs, and Linear B. The Phoenician script was probably the first phonemic script, and it contained only about two dozen distinct letters, making it a script simple enough for traders to learn. Another advantage of the Phoenician alphabet was that it could write different languages since it recorded words phonemically.
The Phoenician script was spread across the Mediterranean by the Phoenicians. The Greek alphabet was the first in which vowels had independent letterforms separate from those of consonants. The Greeks chose letters representing sounds that did not exist in Greek to represent vowels. The Linear B syllabary, used by Mycenaean Greeks from the 16th century BC, had 87 symbols, including five vowels. In its early years, there were many variants of the Greek alphabet, causing many different alphabets to evolve from it.

==== European alphabets ====

The Greek alphabet, in Euboean form, was carried over by Greek colonists to the Italian peninsula c. 800–600 BC giving rise to many different alphabets used to write the Italic languages, like the Etruscan alphabet. One of these became the Latin alphabet, which spread across Europe as the Romans expanded their republic. After the fall of the Western Roman Empire, the alphabet survived in intellectual and religious works. It came to be used for the  Romance languages that descended from Latin and most of the other languages of western and central Europe. Today, it is the most widely used script in the world.
The Etruscan alphabet remained nearly unchanged for several hundred years. Only evolving once the Etruscan language changed itself. The letters used for non-existent phonemes were dropped. Afterwards, however, the alphabet went through many different changes. The final classical form of Etruscan contained 20 letters. Four of them are vowels—⟨a, e, i, u⟩—six fewer letters than the earlier forms. The script in its classical form was used until the 1st century AD. The Etruscan language itself was not used during the Roman Empire, but the script was used for religious texts.
Some adaptations of the Latin alphabet have ligatures, a combination of two letters make one, such as æ in Danish and Icelandic and ⟨Ȣ⟩ in A


Chinese characters are logographs used to write the Chinese languages and others from regions historically influenced by Chinese culture, including Japan, Korea, and Vietnam. Of the four independently invented writing systems accepted by scholars (cuneiform, Egyptian hieroglyphs, Chinese characters, and Maya script), they represent the only one that has remained in continuous use. Over a documented history spanning more than three millennia, the function, style, and means of writing characters have changed greatly. Unlike letters in alphabets that reflect the sounds of speech, Chinese characters generally represent morphemes, the units of meaning in a language. Writing all of the frequently used vocabulary in a language requires roughly 2000–3000 characters; as of 2025, more than 100000 Chinese characters have been identified and included in The Unicode Standard. Characters are created according to several principles, where aspects of shape and pronunciation may be used to indicate the character's meaning.
The first attested characters are oracle bone inscriptions made during the 13th century BCE in what is now Anyang, Henan, as part of divinations conducted by the Shang dynasty royal house. Character forms were originally ideographic or pictographic in style, but evolved as writing spread across China. Numerous attempts have been made to reform the script, including the promotion of small seal script by the Qin dynasty (221–206 BCE). Clerical script, which had matured by the early Han dynasty (202 BCE – 220 CE), abstracted the forms of characters—obscuring their pictographic origins in favour of making them easier to write. Following the Han, regular script emerged as the result of cursive influence on clerical script, and has been the primary style used for characters since. Informed by a long tradition of lexicography, states using Chinese characters have standardized their forms—broadly, simplified characters are used to write Chinese in mainland China, Singapore, and Malaysia; while traditional characters are used in Taiwan, Hong Kong, and Macau.
Where the use of characters spread beyond China, they were initially used to write Literary Chinese; they were then often adapted to write local languages spoken throughout the Sinosphere. In Japanese, Korean, and Vietnamese, Chinese characters are known as kanji, hanja, and chữ Hán respectively. Writing traditions also emerged for some of the other languages of China, like the sawndip script used to write the Zhuang languages of Guangxi. Each of these written vernaculars used existing characters to write the language's native vocabulary, with the addition af the loanwords it borrowed from Chinese. In addition, each invented characters for local use. In written Korean and Vietnamese, Chinese characters have largely been replaced with alphabets—leaving Japanese as the only major non-Chinese language still written using them, alongside the other elements of the Japanese writing system.
At the most basic level, characters are composed of strokes that are written in a fixed order. Historically, methods of writing characters have included inscribing stone, bone, or bronze; brushing ink onto silk, bamboo, or paper; and printing with woodblocks or moveable type. Technologies invented since the 19th century to facilitate the use of characters include Chinese telegraph codes, Chinese typewriters, and several character encodings and Chinese character input methods for computers.

== Development ==

Chinese characters are accepted as representing one of four independent inventions of writing in human history. In each instance, writing evolved from a system using two distinct types of ideographs—either pictographs visually depicting objects or concepts, or fixed signs representing concepts only by shared convention. These systems are classified as proto-writing, because the techniques they used were insufficient to carry the meaning of spoken language by themselves.
Various innovations were required for Chinese characters to emerge from proto-writing. Firstly, pictographs became distinct from simple pictures in use and appearance—for example, the pictograph 大, meaning 'large', was originally a picture of a large man, but one would need to be aware of its specific meaning in order to interpret the sequence 大鹿 as signifying 'large deer', rather than being a picture of a large man and a deer next to one another. Due to this process of abstraction, and to make characters easier to write, pictographs gradually became more simplified and regularized—often to the extent that the original objects represented are no longer obvious.
This proto-writing system was limited to representing a relatively narrow range of ideas with a comparatively small library of symbols. This compelled innovations that allowed for symbols which indicated elements of spoken language directly. In each historical case, this was accomplished by some form of the rebus technique, where the symbol for a word is used to indicate a different word with a similar pronunciation, depending on context. This allowed for words that lacked a plausible pictographic representation to be written down for the first time. This technique preempted more sophisticated methods of character creation that would further expand the lexicon. The process whereby writing emerged from proto-writing took place over a long period; when the purely pictorial use of symbols disappeared, leaving only those representing spoken words, the process was complete.

== Classification ==

Chinese characters have been used in several distinct writing systems throughout history. A writing system is most commonly defined to include the written symbols themselves, called graphemes—which may include characters, numerals, or punctuation—and by the rules by which they are used to record language. Chinese characters are logographs, which are graphemes that represent units of meaning in a language. Specifically, characters represent a language's morphemes, its most basic units of meaning. Morphemes in Chinese—and therefore the characters used to write them—are nearly always a single syllable in length. In some special cases, characters may denote non-morphemic syllables as well; due to this, written Chinese is often characterized as morphosyllabic. Logographs may be contrasted with letters in an alphabet, which generally represent phonemes, the distinct units of sound used by speakers of a language. Despite their origins in picture-writing, Chinese characters are no longer ideographs capable of representing ideas directly; their comprehension relies on the reader's knowledge of the particular language being written.
The areas where Chinese characters were historically used—sometimes collectively termed the Sinosphere—have a long tradition of lexicography attempting to explain and refine their use; for most of history, analysis revolved around a model first popularized in the 2nd-century Shuowen Jiezi dictionary. More recent models have analysed the methods used to create characters, how characters are structured, and how they function in a given writing system.

=== Structural analysis ===
Most characters can be analysed structurally as compounds made of smaller components (部件; bùjiàn), which are often independent characters in their own right, adjusted to occupy a given position in the compound. Components within a character may serve a specific function—phonetic components provide a hint for the character's pronunciation, and semantic components indicate some element of the character's meaning. Components that serve neither function may be classified as pure signs with no particular meaning, other than their presence distinguishing one character from another.
A straightforward structural classification scheme may consist of three pure classes of semantographs, phonographs, and signs—having only semantic, phonetic, and form components respectively—plus classes corresponding to each combination of


Religion is a range of social-cultural systems, including designated behaviors and practices, ethics, morals, beliefs, worldviews, texts, sanctified places, prophecies, or organizations, that generally relate humanity to supernatural, transcendental, and spiritual elements—although there is no scholarly consensus over what precisely constitutes a religion. It is an essentially contested concept. Different religions may or may not contain various elements ranging from the divine, sacredness, faith, and a supernatural being or beings.
The origin of religious belief is an open question, with possible explanations including awareness of individual death, a sense of community, and dreams. Religions have sacred histories, narratives, and mythologies, preserved in oral traditions, sacred texts, symbols, and holy places, that may attempt to explain the origin of life, the universe, and other phenomena. Religious practice may include rituals, sermons, commemoration or veneration (of deities or saints), sacrifices, festivals, feasts, trances, initiations, matrimonial and funerary services, meditation, prayer, music, art, dance, or public service.
There are an estimated 10,000 distinct religions worldwide, though nearly all of them have regionally based, relatively small followings. Four religions—Christianity, Islam, Hinduism, and Buddhism—account for over 73% of the world's population, and 97.6% of the world either follows one of those four religions or identifies as nonreligious, meaning that the vast majority of remaining religions account for only 2.4% of the population combined. The religiously unaffiliated demographic includes those who do not identify with any particular religion, atheists, and agnostics, although many in the demographic still have various religious beliefs. Many world religions are also organized religions, most definitively, including the Abrahamic religions Christianity, Islam, Judaism, and the Baháʼí Faith, while others are arguably less so, in particular folk religions, indigenous religions, and some Eastern religions. A portion of the world's population are members of new religious movements. Scholars have indicated that global religiosity may be increasing due to religious countries having generally higher birth rates.
The study of religion comprises a wide variety of academic disciplines, including theology, philosophy of religion, comparative religion, and social scientific studies. Theories about religion offer various explanations for its origins and workings, including the ontological foundations of religious being and belief.

== Etymology and history of the concept of "religion" ==

=== Etymology ===

The term religion comes from both Old French and Anglo-Norman (1200s CE) and means respect for sense of right, moral obligation, sanctity, what is sacred, reverence for the gods. It is ultimately derived from the Latin word religiō. According to Roman philosopher Cicero, religiō comes from relegere: re (meaning 'again') + lego (meaning 'read'), where lego is in the sense of 'go over', 'choose', or 'consider carefully'. Contrarily, some modern scholars such as Tom Harpur and Joseph Campbell have argued that religiō is derived from religare: re (meaning 'again') + ligare ('bind' or 'connect'), which was made prominent by St. Augustine following the interpretation given by Lactantius in Divinae institutiones, IV, 28. The medieval usage alternates with order in designating bonded communities like those of monastic orders: "we hear of the 'religion' of the Golden Fleece, of a knight 'of the religion of Avys'."

==== Religiō ====

In classic antiquity, religiō broadly meant conscientiousness, sense of right, moral obligation, or duty to anything. Religio was originally not related to gods in antiquity nor was it referring to a social or cultural phenomenon. In the ancient and medieval world, the etymological Latin root religiō was understood as an individual virtue of worship in mundane contexts; never as doctrine, practice, or actual source of knowledge. In general, religiō referred to broad social obligations towards anything including family, neighbors, rulers, and even towards God. Religiō was most often used by the ancient Romans not in the context of a relation towards gods, but as a range of general emotions which arose from heightened attention in any mundane context such as hesitation, caution, anxiety, or fear, as well as feelings of being bound, restricted, or inhibited. The term was also closely related to other terms like scrupulus (which meant "very precisely"), and some Roman authors related the term superstitio (which meant too much fear or anxiety or shame) to religiō at times. When religiō came into English around the 1200s as religion, it took the meaning of "life bound by monastic vows" or monastic orders. The compartmentalized concept of religion, where religious and worldly things were separated, was not used before the 1500s. The concept of religion was first used in the 1500s to distinguish the domain of the church and the domain of civil authorities; the Peace of Augsburg marks such an instance, which has been described by Christian Reus-Smit as "the first step on the road toward a European system of sovereign states."
Roman general Julius Caesar used religiō to mean 'obligation of an oath' when discussing captured soldiers making an oath to their captors. Roman naturalist Pliny the Elder used the term religiō to describe the apparent respect given by elephants to the night sky. Cicero used religiō as being related to cultum deorum (worship of the gods).

==== Threskeia ====
In Ancient Greece, the Greek term threskeia (θρησκεία) was loosely translated into Latin as religiō in late antiquity. Threskeia was sparsely used in classical Greece but became more frequently used in the writings of Josephus in the 1st century CE. It was used in mundane contexts and could mean multiple things from respectful fear to excessive or harmfully distracting practices of others, to cultic practices. It was often contrasted with the Greek word deisidaimonia, which meant too much fear.

=== History of the concept of "religion" ===

Religion is a modern concept and not a universal concept across history, cultures or languages. The concept was invented recently in the English language and is found in texts from the 17th century due to events such as the splitting of Christendom during the Protestant Reformation and globalization in the Age of Exploration, which involved contact with numerous foreign cultures with non-European languages. Some argue that regardless of its definition, it is not appropriate to apply the term religion to non-Western cultures, while some followers of various faiths rebuke using the word to describe their own belief system. Many cultures around the world lack or reject distinctions between the natural and supernatural.
The concept of "ancient religion" stems from modern interpretations of a range of practices that conform to a modern concept of religion, influenced by early modern and 19th century Christian discourse. The concept of religion was formed in the 16th and 17th centuries, despite the fact that ancient sacred texts like the Bible, the Quran, and others did not have a word or even a concept of religion in the original languages and neither did the people or the cultures in which these sacred texts were written. For example, there is no precise equivalent of religion in Hebrew, and Judaism does not distinguish clearly between religious, national, racial, or ethnic identities. One of its central concepts is halakha, meaning the walk or path sometimes translated as law, which guides religious practice and belief and many aspects of daily life. Even though the beliefs and traditions of Judaism are found in the ancient world, ancient Jews saw Jewish identity as being about an ethnic or national identity and did not entail a compulsory belief system or regulated rituals. In the 1st century CE


Art is a diverse range of cultural activity centered around works utilizing creative or imaginative talents, which are expected to evoke a worthwhile experience, generally through an expression of emotional power, conceptual ideas, technical proficiency, or beauty.
There is no generally agreed definition of what constitutes art, and its interpretation has varied greatly throughout history and across cultures. In the Western tradition, the three classical branches of visual art are painting, sculpture, and architecture. Theatre, dance, and other performing arts, as well as literature, music, film and other media such as interactive media, are included in a broader definition of "the arts". Until the 17th century, art referred to any skill or mastery and was not differentiated from crafts or sciences. In modern usage after the 17th century, where aesthetic considerations are paramount, the fine arts are separated and distinguished from acquired skills in general, such as the decorative or applied arts.
The nature of art and related concepts, such as creativity and interpretation, are explored in a branch of philosophy known as aesthetics. The resulting artworks are studied in the professional fields of art criticism and the history of art.

== Overview ==
In the perspective of the history of art, artistic works have existed for almost as long as humankind: from early prehistoric art to contemporary art; however, some theorists think that the typical concept of "artistic works" does not fit well outside modern Western societies. One early sense of the definition of art is closely related to the older Latin meaning, which roughly translates to "skill" or "craft", as associated with words such as "artisan". English words derived from this meaning include artifact, artificial, artifice, medical arts, and military arts. However, there are many other colloquial uses of the word, all with some relation to its etymology.

Over time, philosophers like Plato, Aristotle, Socrates and Immanuel Kant, among others, questioned the meaning of art. Several dialogues in Plato tackle questions about art, while Socrates says that poetry is inspired by the muses and is not rational. He speaks approvingly of this, and other forms of divine madness (drunkenness, eroticism, and dreaming) in the Phaedrus (265a–c), and yet in the Republic wants to outlaw Homer's great poetic art, and laughter as well. In Ion, Socrates gives no hint of the disapproval of Homer that he expresses in the Republic. The dialogue Ion suggests that Homer's Iliad functioned in the ancient Greek world as the Bible does today in the modern Christian world: as divinely inspired literary art that can provide moral guidance, if only it can be properly interpreted.
With regards to the literary art and the musical arts, Aristotle considered epic poetry, tragedy, comedy, Dithyrambic poetry and music to be mimetic or imitative art, each varying in imitation by medium, object, and manner. For example, music imitates with the media of rhythm and harmony, whereas dance imitates with rhythm alone, and poetry with language. The forms also differ in their object of imitation. Comedy, for instance, is a dramatic imitation of men worse than average; whereas tragedy imitates men slightly better than average. Lastly, the forms differ in their manner of imitation—through narrative or character, through change or no change, and through drama or no drama. Aristotle believed that imitation is natural to mankind and constitutes one of mankind's advantages over animals.
The more recent and specific sense of the word art as an abbreviation for creative art or fine art emerged in the early 17th century. Fine art refers to a skill used to express the artist's creativity, or to engage the audience's aesthetic sensibilities, or to draw the audience towards consideration of more refined or finer works of art.
Within this latter sense, the word art may refer to several things: (i) a study of a creative skill, (ii) a process of using the creative skill, (iii) a product of the creative skill, or (iv) the audience's experience with the creative skill. The creative arts (art as discipline) are a collection of disciplines which produce artworks (art as objects) that are compelled by a personal drive (art as activity) and convey a message, mood, or symbolism for the perceiver to interpret (art as experience). Art is something that stimulates an individual's thoughts, emotions, beliefs, or ideas through the senses. Works of art can be explicitly made for this purpose or interpreted on the basis of images or objects. For some scholars, such as Kant, the sciences and the arts could be distinguished by taking science as representing the domain of knowledge and the arts as representing the domain of the freedom of artistic expression.

Often, if the skill is being used in a common or practical way, people will consider it a craft instead of art. Likewise, if the skill is being used in a commercial or industrial way, it may be considered commercial art instead of fine art. On the other hand, crafts and design are sometimes considered applied art. Some art followers have argued that the difference between fine art and applied art has more to do with value judgments made about the art than any clear definitional difference. However, even fine art often has goals beyond pure creativity and self-expression. The purpose of works of art may be to communicate ideas, such as in politically, spiritually, or philosophically motivated art; to create a sense of beauty (see aesthetics); to explore the nature of perception; for pleasure; or to generate strong emotions. The purpose may also be seemingly nonexistent.
The nature of art has been described by philosopher Richard Wollheim as "one of the most elusive of the traditional problems of human culture". Art has been defined as a vehicle for the expression or communication of emotions and ideas, a means for exploring and appreciating formal elements for their own sake, and as mimesis or representation. Art as mimesis has deep roots in the philosophy of Aristotle. Leo Tolstoy identified art as a use of indirect means to communicate from one person to another. Benedetto Croce and R. G. Collingwood advanced the idealist view that art expresses emotions, and that the work of art therefore essentially exists in the mind of the creator. The theory of art as form has its roots in the philosophy of Kant, and was developed in the early 20th century by Roger Fry and Clive Bell. More recently, thinkers influenced by Martin Heidegger have interpreted art as the means by which a community develops for itself a medium for self-expression and interpretation. George Dickie has offered an institutional theory of art that defines a work of art as any artifact upon which a qualified person or persons acting on behalf of the social institution commonly referred to as "the art world" has conferred "the status of candidate for appreciation". Larry Shiner has described fine art as "not an essence or a fate but something we have made. Art as we have generally understood it is a European invention barely two hundred years old."
Art may be characterized in terms of mimesis (its representation of reality), narrative (storytelling), expression, communication of emotion, or other qualities. During the Romantic period, art came to be seen as "a special faculty of the human mind to be classified with religion and science".

== History ==

A shell engraved by Homo erectus was determined to be between 430,000 and 540,000 years old. A set of eight 130,000 years old white-tailed eagle talons bear cut marks and abrasion that indicate manipulation by neanderthals, possibly for using it as jewelry. A series of tiny, drilled snail shells about 75,000 years old—were discovered in a South African cave. Containers that may have been used to hold paints have been found dating as far back as 100,000 years.
The oldest piece of art found in Europe i


Music is the arrangement of sound to create some combination of form, harmony, melody, rhythm, or otherwise expressive content. Music is generally agreed to be a cultural universal that is present in all human societies. Definitions of music vary widely in substance and approach. While scholars agree that music is defined by a small number of specific elements, there is no consensus as to what these necessary elements are. Music is often characterized as a highly versatile medium for expressing human creativity. Diverse activities are involved in the creation of music, and are often divided into categories of composition, improvisation, and performance. Music may be performed using a wide variety of musical instruments, including the human voice. It can also be composed, sequenced, or otherwise produced to be indirectly played mechanically or electronically, such as via a music box, barrel organ, or digital audio workstation software on a computer.
Music often plays a key role in social events and religious ceremonies. The techniques of making music are often transmitted as part of a cultural tradition. Music is played in public and private contexts, highlighted at events such as festivals and concerts for various different types of ensembles. Music is used in the production of other media, such as in soundtracks to films, TV shows, operas, and video games.
Listening to music is a common means of entertainment. The culture surrounding music extends into areas of academic study, journalism, philosophy, psychology, and therapy. The music industry includes songwriters, performers, sound engineers, producers, tour organizers, distributors of instruments, accessories, and publishers of sheet music and recordings. Technology facilitating the recording and reproduction of music has historically included sheet music, microphones, phonographs, and tape machines, with playback of digital music being a common use for MP3 players, CD players, and smartphones.

== Etymology and terminology ==

The modern English word music came into use in the 1630s. It descends from Middle English musike, which in turn descends from Old French musique, then Latin mūsica—and ultimately from Ancient Greek mousiké technē (μουσική τέχνη), a phrase meaning "art of the Muses". The Muses were nine deities in Ancient Greek mythology who presided over the arts and sciences. They were included in tales by the earliest Western authors, Homer and Hesiod, and eventually came to be associated with music specifically. Over time, Polyhymnia would reside over music more prominently than the other muses. The Latin word musica was also the originator for both the Spanish música and French musique via spelling and linguistic adjustment, though other European terms were probably loanwords, including the Italian musica, German Musik, Dutch muziek, Norwegian musikk, Polish muzyka, and Russian muzïka.
The modern Western world usually defines music as an all-encompassing term used to describe diverse genres, styles, and traditions. This is not the case worldwide, and languages such as modern Indonesian (musik) and Shona (musakazo) have recently adopted words to reflect this universal conception, as they did not have words that fit exactly the Western scope. Before Western contact in East Asia, neither Japan nor China had a single word that encompassed music in a broad sense, but culturally, they often regarded music in such a fashion. The closest word to mean music in Chinese, yue, shares a character with le, meaning joy, and originally referred to all the arts before narrowing in meaning. Africa is too diverse to make firm generalizations, but the musicologist J. H. Kwabena Nketia has emphasized African music's often inseparable connection to dance and speech in general. Some African cultures, such as the Songye people of the Democratic Republic of the Congo and the Tiv people of Nigeria, have a strong and broad conception of 'music' but no corresponding word in their native languages. Other words commonly translated as music often have more specific meanings in their respective cultures: the Hindi word for music, sangita, properly refers to art music, while the many Indigenous languages of the Americas have words for music that refer specifically to song but describe instrumental music regardless. Though the Arabic musiqi can refer to all music, it is usually used for instrumental and metric music, while khandan identifies vocal and improvised music.

== History ==

=== Origins and prehistory ===

It is often debated to what extent the origins of music will ever be understood, and there are competing theories that aim to explain it. Many scholars highlight a relationship between the origin of music and the origin of language, and there is disagreement surrounding whether music developed before, after, or simultaneously with language. A similar source of contention surrounds whether music was the intentional result of natural selection or was a byproduct spandrel of evolution. The earliest influential theory was proposed by Charles Darwin in 1871, who stated that music arose as a form of sexual selection, perhaps via mating calls. Darwin's original perspective has been heavily criticized for its inconsistencies with other sexual selection methods, though many scholars in the 21st century have developed and promoted the theory. Other theories include that music arose to assist in organizing labor, improving long-distance communication, benefiting communication with the divine, assisting in community cohesion, or as a defense to scare off predators.
Prehistoric music can only be theorized based on findings from paleolithic archaeology sites. The disputed Divje Babe flute, a perforated cave bear femur, is at least 40,000 years old, though there is considerable debate surrounding whether it is truly a musical instrument or an object formed by animals. The earliest objects whose designations as musical instruments are widely accepted are bone flutes from the Swabian Jura, Germany, namely from the Geissenklösterle, Hohle Fels, and Vogelherd caves. Dated to the Aurignacian (of the Upper Paleolithic) and used by Early European modern humans, from all three caves there are eight examples, four made from the wing bones of birds and four from mammoth ivory; three of these are near complete. Three flutes from the Geissenklösterle are dated as the oldest, c. 43,150–39,370 BP.

=== Antiquity ===

The earliest material and representational evidence of Egyptian musical instruments dates to the Predynastic period, but the evidence is more securely attested in the Old Kingdom when harps, flutes, and double clarinets were played. Percussion instruments, lyres, and lutes were added to orchestras by the Middle Kingdom. Cymbals frequently accompanied music and dance, much as they still do in Egypt today. Egyptian folk music, including the traditional Sufi dhikr rituals, are the closest contemporary music genre to ancient Egyptian music, having preserved many of its features, rhythms and instruments.
The "Hurrian Hymn to Nikkal", found on clay tablets in the ancient Syrian city of Ugarit, is the oldest surviving notated work of music, dating back to approximately 1400 BCE.
Music was an important part of social and cultural life in ancient Greece and was one of the main subjects taught to children. Musical education was considered important for the development of an individual's soul. Musicians and singers played a prominent role in Greek theater, and those who received a musical education were seen as nobles and in perfect harmony (as can be read in the Republic, Plato). Mixed gender choruses performed for entertainment, celebration, and spiritual ceremonies. Instruments included the double-reed aulos and a plucked string instrument, the lyre, principally a special kind called a kithara. Music was an important part of education, and boys were taught music starting at age six. Greek musical literacy created significant


Literature is any collection of written work. The term is also used more narrowly for writings considered an art form, especially novels, plays, and poems. It includes both print and digital writing. In recent centuries, the definition has expanded to include oral literature, much of which has been transcribed. Literature is a method of recording, preserving, and transmitting knowledge and entertainment. It can also have a social, psychological, spiritual, or political role.
Literary criticism is one of the oldest academic disciplines, and is concerned with the literary merit or intellectual significance of specific texts. The study of books and other texts as artifacts or traditions is instead encompassed by textual criticism or the history of the book. "Literature", as an art form, is sometimes used synonymously with literary fiction, fiction written with the goal of artistic merit, but can also include works in various non-fiction genres, such as biography, diaries, memoirs, letters, and essays. Within this broader definition, literature includes non-fictional books, articles, or other written information on a particular subject.
Developments in print technology have allowed an ever-growing distribution and proliferation of written works, while the digital era has blurred the lines between online electronic literature and other forms of modern media.

== Definitions ==

Definitions of literature have varied over time. In Western Europe, prior to the 18th century, literature denoted all books and writing. It can be seen as returning to older, more inclusive notions, so that cultural studies, for instance, include, in addition to canonical works, popular and minority genres. The word is also used in reference to non-written works: to "oral literature" and "the literature of preliterate culture".
Etymologically, the term derives from Latin literatura/litteratura, "learning, writing, grammar," originally "writing formed with letters," from litera/littera, "letter." In spite of this, the term has also been applied to spoken or sung texts. Literature is often referred to synecdochically as "writing," especially creative writing, and poetically as "the craft of writing" (or simply "the craft"). Syd Field described his discipline, screenwriting, as "a craft that occasionally rises to the level of art."
A value judgment definition of literature considers it as consisting solely of high quality writing that forms part of the belles-lettres ("fine writing") tradition. An example of this is in the 1910–1911 Encyclopædia Britannica, which classified literature as "the best expression of the best thought reduced to writing".

== History ==

=== Oral literature ===

The use of the term "literature" here poses some issues due to its origins in the Latin littera, "letter," essentially writing. Alternatives such as "oral forms" and "oral genres" have been suggested, but the word literature is widely used.
Australian Aboriginal culture has thrived on oral traditions and oral histories passed down through tens of thousands of years.
In a study published in February 2020, new evidence showed that both Budj Bim and Tower Hill volcanoes erupted between 34,000 and 40,000 years ago. Significantly, this is a "minimum age constraint for human presence in Victoria", and also could be interpreted as evidence for the oral histories of the Gunditjmara people, an Aboriginal Australian people of south-western Victoria, which tell of volcanic eruptions being some of the oldest oral traditions in existence. An axe found underneath volcanic ash in 1947 had already proved that humans inhabited the region before the eruption of Tower Hill.
Oral literature is an ancient human tradition found in "all corners of the world." Modern archaeology has been unveiling evidence of the human efforts to preserve and transmit arts and knowledge that depended completely or partially on an oral tradition, across various cultures:

The Judeo-Christian Bible reveals its oral traditional roots; medieval European manuscripts are penned by performing scribes; geometric vases from archaic Greece mirror Homer's oral style. (...) Indeed, if these final decades of the millennium have taught us anything, it must be that oral tradition never was the other we accused it of being; it never was the primitive, preliminary technology of communication we thought it to be. Rather, if the whole truth is told, oral tradition stands out as the single most dominant communicative technology of our species as both a historical fact and, in many areas still, a contemporary reality.
The earliest poetry is believed to have been recited or sung, employed as a way of remembering history, genealogy, and law.
In Asia, the transmission of folklore, mythologies as well as scriptures in ancient India, in different Indian religions, was by oral tradition, preserved with precision with the help of elaborate mnemonic techniques.
The early Buddhist texts are also generally believed to be of oral tradition, with the first by comparing inconsistencies in the transmitted versions of literature from various oral societies such as the Greek, Serbia and other cultures, then noting that the Vedic literature is too consistent and vast to have been composed and transmitted orally across generations, without being written down. According to Goody, the Vedic texts likely involved both a written and oral tradition, calling it a "parallel products of a literate society".
All ancient Greek literature was to some degree oral in nature, and the earliest literature was completely so. Homer's epic poetry, states Michael Gagarin, was largely composed, performed and transmitted orally. As folklores and legends were performed in front of distant audiences, the singers would substitute the names in the stories with local characters or rulers to give the stories a local flavor and thus connect with the audience by making the historicity embedded in the oral tradition as unreliable. The lack of surviving texts about the Greek and Roman religious traditions have led scholars to presume that these were ritualistic and transmitted as oral traditions, but some scholars disagree that the complex rituals in the ancient Greek and Roman civilizations were an exclusive product of an oral tradition.
Writing systems are not known to have existed among Native North Americans (north of Mesoamerica) before contact with Europeans. Oral storytelling traditions flourished in a context without the use of writing to record and preserve history, scientific knowledge, and social practices. While some stories were told for amusement and leisure, most functioned as practical lessons from tribal experience applied to immediate moral, social, psychological, and environmental issues. Stories fuse fictional, supernatural, or otherwise exaggerated characters and circumstances with real emotions and morals as a means of teaching. Plots often reflect real life situations and may be aimed at particular people known by the story's audience. In this way, social pressure could be exerted without directly causing embarrassment or social exclusion. For example, rather than yelling, Inuit parents might deter their children from wandering too close to the water's edge by telling a story about a sea monster with a pouch for children within its reach.

==== Oratory ====
Oratory or the art of public speaking was considered a literary art for a significant period of time. From ancient Greece to the late 19th century, rhetoric played a central role in Western education in training orators, lawyers, counselors, historians, statesmen, and poets.

=== Writing ===

Around the 4th millennium BC, the complexity of trade and administration in Mesopotamia outgrew human memory, and writing became a more dependable method of recording and presenting transactions in a permanent form. Though in both ancient Egypt and Mesoamerica, writing may have already emerged because of the need to record historical and e


Architecture is the study and practice of designing structures, especially habitable ones. It utilizes civil engineering techniques, but is considered a visual art. It is both the process and the product of sketching, conceiving, planning, designing, and constructing buildings or other structures. The term comes from Latin  architectura; from Ancient Greek  ἀρχιτέκτων (arkhitéktōn) 'architect'; from  ἀρχι- (arkhi-) 'chief' and  τέκτων (téktōn) 'creator'. Architectural works, in the material form of buildings, are often perceived as cultural symbols and as works of art. Historical civilizations are often identified with their surviving architectural achievements.
The practice of architecture itself, which began in the prehistoric era, has been used as a way of expressing culture by civilizations on all seven continents. For this reason, architecture is considered to be a form of art. Texts on architecture have been written since ancient times. The earliest surviving text on architectural theories is the 1st century BC treatise De architectura by the Roman architect Vitruvius, according to whom a good building embodies firmitas, utilitas, and venustas (durability, utility, and beauty). Centuries later, Leon Battista Alberti developed his ideas further, seeing beauty as an objective quality of buildings to be found in their proportions. In the 19th century, Louis Sullivan declared that "form follows function". "Function" began to replace the classical "utility" and was understood to include not only practical but also aesthetic, psychological, and cultural dimensions. The idea of sustainable architecture was introduced in the late 20th century.
Architecture began as rural, oral vernacular architecture that developed from trial and error to successful replication. Ancient urban architecture was preoccupied with building religious structures and buildings symbolizing the political power of rulers until Greek and Roman architecture shifted focus to civic virtues. Indian and Chinese architecture influenced forms all over Asia and Buddhist architecture in particular took diverse local flavors. During the Middle Ages, pan-European styles of Romanesque and Gothic cathedrals and abbeys emerged while the Renaissance favored Classical forms implemented by architects known by name. Later, the roles of architects and engineers became separated.
Modern architecture began after World War I as an avant-garde movement that sought to develop a completely new style appropriate for a new post-war social and economic order focused on meeting the needs of the middle and working classes. Emphasis was put on modern techniques, materials, and simplified geometric forms, paving the way for high-rise superstructures. Many architects became disillusioned with modernism which they perceived as ahistorical and anti-aesthetic, and postmodern and contemporary architecture developed. Over the years, the field of architectural construction has branched out to include everything from ship design to interior decorating.

== Definitions ==
Architecture can mean:

A general term to describe buildings and other physical structures.
The art and science of designing buildings and (some) nonbuilding structures; sometimes called "architectonics."
The style of design and method of construction of buildings and other physical structures.
A unifying or coherent form or structure.
The knowledge of art, science, technology, and humanity.
The design activity of the architect, from the macro-level (urban design, landscape architecture) to the micro-level (construction details and furniture).
The practice of the architect where architecture means offering or rendering professional services in connection with the design and construction of buildings or built environments.

== Theory ==

The philosophy of architecture is a branch of the philosophy of art, dealing with aesthetic value of architecture, its semantics and its relation to the development of culture. Many philosophers and theoreticians from Plato to Michel Foucault, Gilles Deleuze, Robert Venturi and Ludwig Wittgenstein have concerned themselves with the nature of architecture and whether or not architecture is distinguished from building.

=== Historic treatises ===

The earliest surviving written work on the subject of architecture is De architectura by the Roman architect Vitruvius in the early 1st century BC. According to Vitruvius, a good building should satisfy the three principles of firmitas, utilitas, venustas, commonly known by the original translation – firmness, commodity and delight. An equivalent in modern English would be:

Durability – a building should stand up robustly and remain in good condition
Utility – it should be suitable for the purposes for which it is used
Beauty – it should be aesthetically pleasing
According to Vitruvius, the architect should strive to fulfill each of these three attributes as well as possible. Leon Battista Alberti, who elaborates on the ideas of Vitruvius in his treatise, De re aedificatoria, saw beauty primarily as a matter of proportion, although ornament also played a part. For Alberti, the rules of proportion were those that governed the idealized human figure, the golden mean. The most important aspect of beauty was, therefore, an inherent part of an object, rather than something applied superficially, and was based on universal, recognizable truths. The notion of style in the arts was not developed until the 16th century, with the writing of Giorgio Vasari. By the 18th century, his Lives of the Most Excellent Painters, Sculptors, and Architects had been translated into Italian, French, Spanish, and English.
In the 16th century, Italian Mannerist architect, painter and theorist Sebastiano Serlio wrote Tutte L'Opere D'Architettura et Prospetiva (Complete Works on Architecture and Perspective). This treatise exerted immense influence throughout Europe, being the first handbook that emphasized the practical rather than the theoretical aspects of architecture, and it was the first to catalog the five orders.
In the early 19th century, Augustus Welby Northmore Pugin wrote Contrasts (1836) that, as the title suggested, contrasted the modern, industrial world, which he disparaged, with an idealized image of neo-medieval world. Gothic architecture, Pugin believed, was the only "true Christian form of architecture." The 19th-century English art critic, John Ruskin, in his Seven Lamps of Architecture, published 1849, was much narrower in his view of what constituted architecture. Architecture was the "art which so disposes and adorns the edifices raised by men ... that the sight of them" contributes "to his mental health, power, and pleasure". For Ruskin, the aesthetic was of overriding significance. His work goes on to state that a building is not truly a work of architecture unless it is in some way "adorned". For Ruskin, a well-constructed, well-proportioned, functional building needed string courses or rustication, at the very least.
On the difference between the ideals of architecture and mere construction, the 20th-century architect Le Corbusier wrote: "You employ stone, wood, and concrete, and with these materials you build houses and palaces: that is construction. Ingenuity is at work. But suddenly you touch my heart, you do me good. I am happy and I say: This is beautiful. That is Architecture". Le Corbusier's contemporary Ludwig Mies van der Rohe is said to have stated in a 1959 interview that "architecture starts when you carefully put two bricks together. There it begins."

=== Modern concepts ===

The notable 19th-century architect of skyscrapers, Louis Sullivan, promoted an overriding precept to architectural design: "Form follows function". While the notion that structural and aesthetic considerations should be entirely subject to functionality was met with both popularity and skepticism, it introduced the concept of "function" in place of Vitruvius' "utility". "Function" came to


Law is a set of rules that are created and enforced by governmental or societal institutions to regulate behavior, with its precise definition a matter of longstanding debate. It has been variously described as a science and as the art of justice. State-enforced laws can be made by a legislature, resulting in statutes; by the executive through decrees and regulations; or by judges' decisions, which form precedent in common law jurisdictions. An autocrat may exercise those functions within their realm. The creation of laws themselves may be influenced by a constitution, written or tacit, and the rights encoded therein. The law shapes politics, economics, history, and society in various ways and also serves as a mediator of relations between people.
Legal systems vary between jurisdictions, with their differences analysed in comparative law. In civil law jurisdictions, a legislature or other central body codifies and consolidates the law. In common law systems, judges may make binding case law through precedent, although on occasion this may be overturned by a higher court or the legislature. Religious law is in use in some religious communities and states, and has historically influenced secular law.
The scope of law can be divided into two domains: public law concerns government and society, including constitutional law, administrative law, and criminal law; private law deals with legal disputes between parties in areas such as contracts, property, torts, delicts and commercial law.
This distinction is stronger in civil law countries, particularly those with a separate system of administrative courts; by contrast, the public-private law divide is less pronounced in common law jurisdictions.
Law provides a source of scholarly inquiry into legal history, philosophy, economic analysis and sociology. Law also raises important and complex issues concerning equality, fairness, and justice.

== Etymology ==
The word law, attested in Old English as lagu, comes from the Old Norse word lǫg. The singular form lag meant 'something laid or fixed' while its plural meant 'law'.

== Philosophy of law ==

The philosophy of law is commonly known as jurisprudence. Normative jurisprudence asks "what should law be?", while analytic jurisprudence asks "what is law?"

=== Analytical jurisprudence ===

There have been several attempts to produce "a universally acceptable definition of law". In 1972, Baron Hampstead suggested that no such definition could be produced. McCoubrey and White said that the question "what is law?" has no simple answer. Glanville Williams said that the meaning of the word "law" depends on the context in which that word is used. He said that, for example, "early customary law" and "municipal law" were contexts where the word "law" had two different and irreconcilable meanings. Thurman Arnold said that it is obvious that it is impossible to define the word "law" and that it is also equally obvious that the struggle to define that word should not ever be abandoned. It is possible to take the view that there is no need to define the word "law" (e.g. "let's forget about generalities and get down to cases").
One definition is that law is a system of rules and guidelines enforced by social institutions to govern behaviour. In The Concept of Law, H. L. A. Hart argued that law is a "system of rules"; John Austin said law was "the command of a sovereign, backed by the threat of a sanction"; Ronald Dworkin describes law as an "interpretive concept" to achieve justice in his text titled Law's Empire; and Joseph Raz argues law is an "authority" to mediate people's interests. Oliver Wendell Holmes defined law as "the prophecies of what the courts will do in fact, and nothing more pretentious." In his Treatise on Law, Thomas Aquinas argues that law is a rational ordering of things, which concern the common good, that is promulgated by whoever is charged with the care of the community. This definition has both positivist and naturalist elements.

=== Connection to morality and justice ===

Definitions of law often raise the question of the extent to which law incorporates morality. John Austin's utilitarian answer was that law is "commands, backed by threat of sanctions, from a sovereign, to whom people have a habit of obedience". Natural lawyers, on the other hand, such as Jean-Jacques Rousseau, argue that law reflects essentially moral and unchangeable laws of nature. The concept of "natural law" emerged in ancient Greek philosophy concurrently and in connection with the notion of justice, and re-entered the mainstream of Western culture through the writings of Thomas Aquinas, notably his Treatise on Law.
Hugo Grotius, the founder of a purely rationalistic system of natural law, argued that law arises from both a social impulse—as Aristotle had indicated—and reason. Immanuel Kant believed a moral imperative requires laws "be chosen as though they should hold as universal laws of nature". Jeremy Bentham and his student Austin, following David Hume, believed that this conflated the "is" and what "ought to be" problem. Bentham and Austin argued for law's positivism; that real law is entirely separate from "morality". Kant was also criticised by Friedrich Nietzsche, who rejected the principle of equality, and believed that law emanates from the will to power, and cannot be labeled as "moral" or "immoral".
In 1934, the Austrian philosopher Hans Kelsen continued the positivist tradition in his book the Pure Theory of Law. Kelsen believed that although law is separate from morality, it is endowed with "normativity", meaning we ought to obey it. While laws are positive "is" statements (e.g., the fine for reversing on a highway is €500), laws tell us what we "should" do. Thus, each legal system can be hypothesised to have a 'basic norm' (German: Grundnorm) instructing us to obey. Kelsen's major opponent, Carl Schmitt, rejected both positivism and the idea of the rule of law because he did not accept the primacy of abstract normative principles over concrete political positions and decisions. Therefore, Schmitt advocated a jurisprudence of the exception (state of emergency), which denied that legal norms could encompass all of the political experience.
Later in the 20th century, H. L. A. Hart attacked Austin for his simplifications and Kelsen for his fiction in The Concept of Law. Hart argued law is a system of rules, divided into primary (rules of conduct) and secondary ones (rules addressed to officials to administer primary rules). Secondary rules are further divided into rules of adjudication (to resolve legal disputes), rules of change (to vary laws), and the rule of recognition (to identify laws as valid). Two of Hart's students continued the debate: In his book Law's Empire, Ronald Dworkin attacked Hart and the positivists for their refusal to treat law as a moral issue. Dworkin argues that law is an "interpretive concept" that requires judges to find the best fitting and most just solution to a legal dispute, given their Anglo-American constitutional traditions. Joseph Raz, on the other hand, defended the positivist outlook and criticised Hart's "soft social thesis" approach in The Authority of Law. Raz argues that law is authority, identifiable purely through social sources and without reference to moral reasoning. In his view, any categorisation of rules beyond their role as authoritative instruments in mediation is best left to sociology rather than to jurisprudence.

== History ==

The history of law is closely linked to the development of civilization. Ancient Egyptian law, dating as far back as 3000 BC, was based on the concept of Ma'at and characterised by tradition, rhetorical speech, social equality and impartiality. By the 22nd century BC, the ancient Sumerian ruler Ur-Nammu had formulated the first law code, which consisted of casuistic statements ("if … then ..."). Around 1760 BC, King Hammurabi further developed Babylonian law by codifying and


Governance is the overall complex system or framework of processes, functions, structures, rules, laws and norms born out of the relationships, interactions,  power dynamics and communication within an organized group of individuals. It sets the boundaries of acceptable conduct and practices of different actors of the group and controls their decision-making powers through the creation and enforcement of rules and regulations. Furthermore, it also manages, allocates and mobilizes relevant resources and capacities of different members and sets the overall direction of the group in order to effectively address its specific collective needs, problems and challenges.
The concept of governance can be applied to social, political or economic entities (groups of individuals engaged in some purposeful activity) such as a state and its government (public administration), a governed territory, a society, a community, a social group (like a tribe or a family), a formal or informal organization, a corporation, a non-governmental organization, a non-profit organization, a project team, a market, a network or even on the global stage. "Governance" can also pertain to a specific sector of activities such as land, environment, health, internet, security, etc. The degree of formality in governance depends on the internal rules of a given entity and its external interactions with similar entities. As such, governance may take many forms, driven by many different motivations and with many different results.
Smaller groups may rely on informal leadership structures, whereas effective governance of a larger group typically relies on a well-functioning governing body, which is a specific group of people entrusted with the authority and responsibilities to make decisions about the rules, enforcing them and overseeing the smooth operation of the group within the broader framework of governance. The most formal type of a governing body is a government, which has the responsibility and authority to make binding decisions for a specific geopolitical system (like a country) through established rules and guidelines. A government may operate as a democracy where citizens vote on who should govern towards the goal of public good. Beyond governments, other entities can also have governing bodies. These can be legal entities or organizations, such as corporations, companies or  non-profit organizations governed by small boards of directors pursuing more specific aims. They can also be socio-political groups including hierarchical political structures, tribes, religious subgroups, or even families. In the case of a state, governance expresses a growing awareness of the ways in which diffuse forms of power and authority can secure order even in the absence of state activity. A variety of external actors without decision-making power can influence this system of state governance. These include lobbies, think-tanks, political parties, non-government organizations, community and media. Governance is also shaped by external factors such as globalization, social movements or technological progress.
Many institutions of higher education - such as the Balsillie School of International Affairs, Munk School of Global Affairs, Sciences Po Paris, Graduate Institute Geneva, Hertie School, and the London School of Economics, among others - offer governance as an academic subjects. Many social scientists prefer to use the term "governance" when discussing the process of governing, because it covers the whole range of institutions and involved relationships.

== Definitions ==
The World Bank defines governance as:

the manner in which power is exercised in the management of a country's economic and social resources for development.
The Worldwide Governance Indicators project of the World Bank defines governance as:

the traditions and institutions by which authority in a country is exercised.
This considers the process by which governments are selected, monitored and replaced; the capacity of the government to effectively formulate and implement sound policies and the respect of citizens and the state of the institutions that govern economic and social interactions among them.
An alternate definition sees governance as:

the use of institutions, structures of authority and even collaboration to allocate resources and coordinate or control activity in society or the economy.
According to the United Nations Development Programme's Regional Project on Local Governance for Latin America:

Governance has been defined as the rules of the political system to solve conflicts between actors and adopt decision (legality). It has also been used to describe the "proper functioning of institutions and their acceptance by the public" (legitimacy). And it has been used to invoke the efficacy of government and the achievement of consensus by democratic means (participation).

== Origin of the word ==

Like government, the word governance derives, ultimately, from the Greek verb kubernaein [kubernáo] (meaning to steer, the metaphorical sense first being attested in Plato). Its occasional use in English to refer to the specific activity of ruling a country can be traced to early-modern England, when the phrase "governance of the realm" appears in works by William Tyndale and in royal correspondence from James V of Scotland to Henry VIII of England. The first usage in connection with institutional structures (as distinct from individual rule) appears in Charles Plummer's The Governance of England (an 1885 translation from a 15th-century Latin manuscript by John Fortescue, also known as The Difference between an Absolute and a Limited Monarchy). This usage of "governance" to refer to the arrangements of governing became orthodox including in Sidney Low's seminal text of the same title in 1904 and among some later British constitutional historians.
However, the use of the term governance in its current broader sense, encompassing the activities of a wide range of public and private institutions, acquired general currency only as recently as the 1990s, when it was re-minted by economists and political scientists and disseminated by institutions such as the UN, the IMF and the World Bank.
Since then, the term has gained increasing usage.

== Types ==
Governance often refers to a particular level of governance associated with a type of organization (including public governance, global governance, non-profit governance, corporate governance, and project governance), a particular 'field' of governance associated with a type of activity or outcome (including environmental governance, internet governance, and information technology governance), or a particular 'model' of governance, often derived as an empirical or normative theory (including regulatory governance, participatory governance, multilevel governance, metagovernance, and collaborative governance).
Governance can also define normative or practical agendas. Normative concepts of fair governance or good governance are common among political, public sector, voluntary, and private sector organizations.

=== Governance as process ===
In its most abstract sense, governance is a theoretical concept referring to the actions and processes by which stable practices and organizations arise and persist. These actions and processes may operate in formal and informal organizations of any size; and they may function for any purpose, good or evil, for profit or not. Conceiving of governance in this way, one can apply the concept to states, to corporations, to non-profits, to NGOs, to partnerships and other associations, to business relationships (especially complex outsourcing relationships), to project teams, and to any number of humans engaged in some purposeful activity.
Most theories of governance as process arose out of neoclassical economics. These theories build deductive models, based on the assumptions of modern economics, to show how rational actors may come to e