This document defines and provides brief descriptions of several genres of literature including fiction, nonfiction, realistic fiction, historical fiction, fantasy, science fiction, horror, and mystery. Fiction means the story is made up, nonfiction tells about real things and has facts, realistic fiction has made-up characters but realistic events, and historical fiction is similar but set in the past. Fantasy and science fiction involve imaginary elements like magic or advanced technology. Horror and mystery aim to scare or puzzle the reader with crimes or puzzling events to be solved.