Genre ("kind" or "sort", from Latin: genus (stem gener-), Greek: genos) is any category of literature or other forms of art or entertainment, e.g. music, whether written or spoken, audio or visual, based on some set of stylistic criteria. Genres are formed by conventions that change over time as new genres are invented and the use of old ones are discontinued. Often, works fit into multiple genres by way of borrowing and recombining these conventions.