The most general genres in literature are (in loose chronological order) epic, tragedy, comedy, novel, and short story. They can all be in the genres prose or poetry, which shows best how loosely genres are defined. Additionally, a genre such as satire might appear in any of the above, not only as a subgenre but as a mixture of genres. Finally, they are defined by the general cultural movement of the historical period in which they were composed. In popular fiction, which is especially divided by genres, genre fiction is the more usual term.