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. Cast types or roles Actors are selected to play various types of roles. Main cast, also called starring roles, consist of 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 called ensemble cast, which comprises multiple principal actors and performers who are typically assigned roughly equal amounts of screen time. A supporting actor is an actor who performs a role in a play or film below that of the leading actor(s). Supporting roles are above that of a bit part, which is direct interaction with the principal actors and 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 called cameo appearance. Casting process 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. These audition pieces are usually videotaped, typically in the form of screen tests and then attached with resumes, as well as head shots and or viewed online via websites such as IMDb, then shared with film producers, film directors and or studio executives. Later stages may involve groups of actors both union, (SAG-AFTRA) and non-union depending on the size and scope of the