A model (from Middle French modelle), is a person with a role either to promote, display, or advertise commercial products (notably fashion clothing) or to serve as a visual aide for people who are creating works of art. Modelling ("modeling" in American English) is considered to be different from other types of public performance, such as acting or dancing. Although the difference between modelling and performing is not always clear, appearing in a film or a play are generally not considered "modelling". Types of modelling include fashion, glamour, fitness, bikini, fine art, body-part and commercial print models. Models are featured in a variety of media formats including books, magazines, films, newspapers, and TV. Fashion models are sometimes featured in films (Looker), reality TV shows (America's Next Top Model, The Janice Dickinson Modeling Agency), and music videos ("Freedom! '90", "Wicked Game", "Daughters", "Blurred Lines"). Celebrities, including actors, singers, sports personalities and reality TV stars, frequently take modelling contracts in addition to their regular work.