A model is a person with a role either to display commercial products (notably fashion clothing in fashion shows) or to serve as an artist's model or to pose for photography. Modelling ("modeling" in American English) is considered to be different from other types of public performance, such as acting or dancing; thus, appearing in a film or a play is not generally considered to be "modelling". Personal opinions are normally not expressed, and a model's reputation and image are considered critical. Types of modelling include: fine art, fashion, glamour, fitness, and body-part promotional modelling. Models are featured in various media formats, including books, magazines, films, newspapers, the Internet, and television. Fashion modelling is sometimes featured in reality TV shows (America's Next Top Model). Celebrities, including actors, singers, sports personalities and reality TV stars, frequently participate in modelling contests, assignments, and contracts in addition to their regular work. Modelling often is a part-time activity. Source: Wikipedia (en)