All are types of literature, including prose; however, some prose (e.g., essays--Francis Bacon) tend not to be viewed as Literature.
The term has generally come to identify a collection of texts or work of art, which in Western culture are mainly prose, both fiction and non-fiction, drama and poetry. In much, if not all of the world, texts can be oral as well, and include such genres as epic, legend, myth, ballad, plus other forms of oral poetry, and the folktale.
Literature - Wikipedia, the free encyclopedia
Definition of Literature, Types of Literature, Importance of Literature, Literature Online.