Literary genres can be divided into four main types: poetry, drama, fiction, and non-fiction. Poetry is the earliest genre and uses meter and rhythm. Drama refers to works meant to be performed on stage by actors and includes tragedies, comedies, and tragicomedies. Fiction encompasses imaginative works like novels, short stories, and novellas. Non-fiction includes factual genres such as memoirs, biographies, and autobiographies. The classification of genres can vary over time, region, and culture.