Subgenre and Hybrid Forms

Genres are often divided into subgenres. Literature, for example, is divided into three basic kinds of literature, classic genres of Ancient Greece, poetry, drama, and prose. Poetry may then be subdivided into epic, lyric, and dramatic. Subdivisions of drama includes formost comedy and tragedy, while eg. comedy itself has subgenres, including farce, comedy of manners, burlesque, satire, and so on. However, any of these terms would be called "genre", and its possible more general terms implied.

Hybrid forms of different terms have been used, like a prose poem or a tragicomedy. Science fiction has many recognized subgenres; a science fiction story may be rooted in real scientific expectations as they are understood at the time of writing (see Hard science fiction). A more general term, coined by Robert A. Heinlein, is "speculative fiction," an umbrella term covering all such genres that depict alternate realities. Even fiction that depicts innovations ruled out by current scientific theory, such as stories about or based on faster-than-light travel, are still science fiction, because science is a main subject in the piece of art.