Literature (from Latin litteraetantri (plural); letter) is the art of written works, and is not bound to published sources (although, under circumstances unpublished sources can be exempt). Literally translated, the word literature means "acquaintance with letters" (as in the "arts and letters"). The two major classification of literature are poetry and prose.
"Literature" is at times differentiated from popular and ephemeral classes of writing. Terms such as "literary fiction" and "literary merit" are used to distinguish individual works as art-literature rather than vernacular writing, and some critics exclude works from being "literary", for example, on grounds of weak or faulty style, use of slang, poor characterization and shallow or contrived construction. Others exclude all genres such as romance, crime and mystery, science fiction, horror and fantasy. Pop lyrics, which are not technically a written medium at all, have also been drawn into this controversHistory of literature

Old book bindings at the Merton College, Oxford library

The Epic of Gilgamesh is one of the earliest known literary works. This Babylonian epic poem arises from stories in the Sumerian language. Although the Sumerian stories are older (probably dating to at least 2100 B.C.), it was probably composed around 1900 BC. The epic deals with themes of heroism, friendship, loss, and the quest for eternal life.
Different historical periods are reflected in their literature. National and tribal sagas, accounts of the origin of the world and of customs, and myths which sometimes carry moral or spiritual messages predominate in the pre-urban eras. The epics of Homer, dating from the early to middle Iron age, and the great Indian epics of a slightly later period, have more evidence of deliberate literary authorship, surviving like the older myths through oral tradition for long periods before being written down.
As a more urban culture developed, academies provided a means of transmission for speculative and philosophical literature in early civilizations, resulting in the prevalence of literature in Ancient China, Ancient India, Persia and Ancient Greece and Rome. Many works of earlier periods, even in narrative form, had an covert moral or didactic purpose, such as the Sanskrit Panchatantra or the Metamorphoses of Ovid. Drama and satire also developed as urban culture provided a larger public audience, and later readership, for literary production. Lyric poetry (as opposed to epic poetry) was often the speciality of courts and aristocratic circles, particularly in East Asia where songs were collected by the Chinese aristocracy as poems, the most notable being the Shijing or Book of Songs. Over a long period, the poetry of popular pre-literate balladry and song interpenetrated and eventually influenced poetry in the literary medium.
In ancient China, early literature was primarily focused on philosophy, historiography, military science, agriculture, and poetry. China, the origin of modern paper making and woodblock printing, produced one of the world's first print cultures.^[1] Much of Chinese literature originates with the Hundred Schools of Thought period that occurred during the Eastern Zhou Dynasty (770-256 BCE). The most important of these include the Classics of Confucianism, of Daoism, of Mohism, of Legalism, as well as works of military science (e.g. Sun Tzu's The Art of War) and Chinese history (e.g. Sima Qian's Records of the Grand Historian). Ancient Chinese literature had a heavy emphasis on historiography. The Chinese kept consistent and accurate court records after the year 841 BCE, with the beginning of the Gonghe regency of the Western Zhou Dynasty. The earliest known narrative history of China was the Zuo Zhuan, which was compiled no later than 389 BCE, and attributed to the blind 5th century BCE historian Zuo Qiuming.
In ancient India, literature originated from stories that were originally orally transmitted. Early genres included drama, fables, sutras and epic poetry. Sanskrit literature begins with the Vedas, dating back to 1500–1000 BCE, and continues with the Sanskrit Epics of Iron Age India. The Vedas are among the oldest sacred texts. The Samhitas date to roughly 1500–1000 BCE, and the "circum-Vedic" texts, as well as the redaction of the Samhitas, date to c. 1000-500 BCE, resulting in a Vedic period, spanning the mid 2nd to mid 1st millennium BCE, or the Late Bronze Age and the Iron Age.^[2] The period between approximately the 6th to 1st centuries BC saw the composition and redaction of the two most influential Indian epics, the Mahabharata and the Ramayana, with subsequent redaction progressing down to the 4th century AD.
In ancient Greece, the epics of Homer, who wrote the Iliad and the Odyssey, and Hesiod, who wrote Works and Days and Theogony, are some of the earliest, and most influential, of Ancient Greek literature. Classical Greek genres included philosophy, poetry, historiography, comedies and dramas. Plato and Aristotle authored philosophical texts that are the foundation of Western philosophy, Sappho and Pindar were influential lyrical poets, and Herodotus and Thucydides were early Greek historians. Although drama was popular in Ancient Greece, of the hundreds of tragedies written and performed during the classical age, only a limited number of plays by three authors still exist: Aeschylus, Sophocles, and Euripides. The plays of Aristophanes provide the only real examples of a genre of comic drama known as Old Comedy, the earliest form of Greek Comedy, and are in fact used to define the genre.^[3]

Johann Wolfgang von Goethe, German writer and author of the Faust books

Roman histories and biographies anticipated the extensive mediaeval literature of lives of saints and miraculous chronicles, but the most characteristic form of the Middle Ages was the romance, an adventurous and sometimes magical narrative with strong popular appeal. Controversial, religious, political and instructional literature proliferated during the Renaissance as a result of the invention of printing, while the mediaeval romance developed into a more character-based and psychological form of narrative, the novel, of which early and important examples are the Chinese Monkey and the German Faust books.
In the Age of Reason philosophical tracts and speculations on history and human nature integrated literature with social and political developments. The inevitable reaction was the explosion of Romanticism in the later 18th century which reclaimed the imaginative and fantastical bias of old romances and folk-literature and asserted the primacy of individual experience and emotion. But as the 19th-century went on, European fiction evolved towards realism and naturalism, the meticulous documentation of real life and social trends. Much of the output of naturalism was implicitly polemical, and influenced social and political change, but 20th century fiction and drama moved back towards the subjective, emphasising unconscious motivations and social and environmental pressures on the individual. Writers such as Eliot, Joyce, Kafka and Pirandello exemplify the trend of documenting internal rather than external realities.
Genre fiction, conventionally equated with escapism and static formulas, also threw reality into question in its distinctive 20th-Century developments, through the enquiries of the ever-sceptical detective and the alternative realities of science fiction. The separation of "mainstream" and "genre" forms (including journalism) continued to blur during the period up to our own times.