Literary genres are categories that classify written works based on their style, form, and content. Common genres include fiction, non-fiction, poetry, and drama. Each genre has its own conventions and characteristics, making it easier for readers to identify the type of story or information they can expect. Within these main genres, there are sub-genres that further define the work. For example, fiction can be divided into science fiction, fantasy, and mystery, while non-fiction includes biographies, essays, and self-help. Understanding these genres helps readers choose books that match their interests.