[custom_adv] A model is a person with a role either to promote, display or advertise commercial products (notably fashion clothing in fashion shows), or to serve as a visual aid for people who are creating works of art or to pose for photography. [custom_adv] 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 is not generally considered to be "modelling". [custom_adv] Types of modelling include: fashion, glamour, fitness, bikini, fine art, body-part, promotional, and commercial print models. Models are featured in a variety of media formats including: books, magazines, films, newspapers, internet and television. [custom_adv] A modeling agency is a company that represents fashion models, to work for the fashion industry. These agencies earn their income via commission, usually from the deal they make with the model and/or the head agency. [custom_adv] The top agencies work with big-budget advertising agencies and fashion designers. They invest money into developing their talent so they can increase their status within the industry. [custom_adv] These top agencies will help train models, get test shoots, layout portfolios, and put together comp cards (composition photo cards) and other printed materials models need.