Literature, most generically, is any body of written works. More restrictively, literature refers to writing considered to be an art form or any single writing deemed to have artistic or intellectual value, often due to deploying language in ways that differ from ordinary usage. Its Latin root literatura/litteratura (derived itself from littera: letter or handwriting) was used to refer to all written accounts. The concept has changed meaning over time to include texts that are spoken or sung (oral literature), and non-written verbal art forms. Developments in print technology have allowed an ever-growing distribution and proliferation of written works, culminating in electronic literature. Literature is 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 categorized according to historical periods or their adherence to certain aesthetic features or expectations (genre).