A genre of writing and media (including novels, short stories, movies and television shows) in which fantastic things happen. Fantasy is often lumped together with science fiction and many science fiction authors are also fantasy authors and vice versa. The key difference is that science fiction stories are usually based at least somewhat on a scientific premise (though the basis may be very loose) or a futuristic setting, whereas fantasy tends to be based on magical or mythical premeses, often (but not always) derived from folklore.