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The Motion Picture Association of America's film-rating system is used in the U.S. and its territories to rate a film's suitability for certain audiences. The MPAA rating system is a voluntary scheme not enforced by law and 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 used to help parents decide what films are appropriate for their children.

The MPAA's rating system is administered by the Classification & Ratings Administration (CARA), an independent agency.

Entertainment is a form of activity that holds the attention and interest of an audience, or gives pleasure and delight. It can be an idea or a task, but is more likely to be one of the activities or events that have developed over thousands of years specifically for the purpose of keeping an audience's attention. Although people's attention is held by different things, because individuals have different preferences in entertainment, most forms are recognisable and familiar. Storytelling, music, drama, dance, and different kinds of performance exist in all cultures, were supported in royal courts, developed into sophisticated forms and over time became available to all citizens. The process has been accelerated in modern times by an entertainment industry which records and sells entertainment products. Entertainment evolves and can be adapted to suit any scale, ranging from an individual who chooses a private entertainment from a now enormous array of pre-recorded products; to a banquet adapted for two; to any size or type of party, with appropriate music and dance; to performances intended for thousands; and even for a global audience.

The experience of being entertained has come to be strongly associated with amusement, so that one common understanding of the idea is fun and laughter, although many entertainments have a serious purpose. This may be the case in the various forms of ceremony, celebration, religious festival, or satire for example. Hence, there is the possibility that what appears as entertainment may also be a means of achieving insight or intellectual growth.