A movie star (also known as a film star and cinema star) is a celebrity who is well-known, or famous, for his or her starring, or leading, roles in motion pictures. The term may also apply to an actor or actress who is recognized as a marketable commodity and whose name is used to promote a movie in trailers and posters. The most widely known, prominent or successful actors are sometimes called “superstars” by writers and journalists. According to an online dictionary, a movie star is an actor or actress who is famous for playing leading roles in movies.