Fiction is the form of any work that deals, in part or in whole, with information or events that are not factual, but rather, imaginary and theoretical—that is, invented by the author. Although fiction describes a major branch of literary work, it may also refer to theatrical, cinematic, or musical work. Fiction contrasts with non-fiction, which deals exclusively with factual (or, at least, assumed factual) events, descriptions, observations, etc. (e.g., biographies, histories).