The Motion Picture Association of America's (MPAA) film-rating system is used in the United States and its territories to rate a film's suitability for certain audiences, based on its content. The MPAA rating system is a voluntary scheme that is not enforced by law; films can be exhibited without a rating, though many theaters refuse to exhibit non-rated or NC-17 rated films. Non-members of MPAA may also submit films for rating. Other media (such as television programs and video games) may be rated by other entities. The MPAA rating system is one of various motion picture rating systems that are used to help parents decide what films are appropriate for their children.