In the performing arts industry such as theatre, film, or television, casting, or a casting call, is a pre-production process for selecting a certain type of actor, dancer, singer, or extra for a particular role or part in a script, screenplay, or teleplay. This process may be used for a motion picture, television program, documentary film, music video, play, or advertisement, intended for an audience.
Actors are selected to play various types of roles. Main cast, also called starring roles, comprise several actors whose appearances are significant in film, theatre, or television. There is often a leading actor (or sometimes leading actress for a woman) who plays the largest role, that of the protagonist in a production. When there is not a single leading actor, the main roles are referred to collectively as an ensemble cast, which comprises several principal actors and performers who are typically assigned roughly equal screen time. A supporting actor is one with a role that is important to a play or film, but less so than that of the leading actor(s). A supporting role is more important than a bit part, which involves direct interaction with the principal actors but no more than five lines of dialogue, often referred to as a "five-or-less" or "under-five" in the United States, or "under-sixes" in British television. When a well-known actor or other celebrity appears in a bit part, it is sometimes called a cameo appearance.
The casting process involves a series of auditions before a casting panel, composed of individuals within a theatrical production such as theatrical producer, and theater director. However, within a given television production a casting panel can consist of a television producer, or within film production a casting panel could contain a film producer, film director, and/or choreographer. Usually, in nearly all areas of show business, a casting director is on this panel as well. In the early stages of this process performers often may present, or are presented with prepared audition pieces such as monologues, songs, choreography, scripts and or sides.