Literature is a term that does not have a universally accepted definition, but which has variably included all written work; writing that possesses literary merit; and language that foregrounds literariness, as opposed to ordinary language. Etymologically the term derives from Latin literatura/litteratura "writing formed with letters", although some definitions include spoken or sung texts. Literature can be classified according to whether it is fiction or non-fiction, and whether it is poetry or prose; it can be further distinguished according to major forms such as the novel, short story or drama; and works are often categorised according to historical periods, or according to their adherence to certain aesthetic features or expectations (genre).

Literature may consist of texts based on factual information (journalistic or non-fiction), a category that may also include polemical works, biographies, and reflective essays, or it may consist of texts based on imagination (such as fiction, poetry, or drama). Literature written in poetry emphasizes the aesthetic and rhythmic qualities of language—such as sound, symbolism, and metre—to evoke meanings in addition to, or in place of, ordinary meanings, while literature written in prose applies ordinary grammatical structure and the natural flow of speech. Literature can also be classified according to historical periods, genres, and political influences. While the concept of genre has broadened over the centuries, in general, a genre consists of artistic works that fall within a certain central theme; examples of genre include romance, mystery, crime, fantasy, erotica, and adventure, among others.