A model (from Middle French modèle), sometimes called a mannequin, is a person who is employed for the purpose of displaying and promoting fashion clothing or other products and for advertising or promotional purposes or who poses for works of art.
Modelling ("modelling" with a doubled "l" is British spelling, vs "modeling" single "l" American spelling) is distinguished from other types of public performance, such as an acting, dancing or mime artist, although the boundary is not well defined. Appearing in a movie or a play is not considered modelling.
Types of modelling include fashion, glamour, fitness, bikini, fine art, and body-part models. Models are features in a variety of media formats including books, magazines, movies, newspapers, and TV. The models themselves can be a featured part of a movie (Looker, Tattoo), reality television show (America's Next Top Model, The Janice Dickinson Modeling Agency), or music video ("Freedom! '90", "Wicked Game", "Daughters").