They often time their words to fit the on-screen action. Extras perform in non-speaking roles. They stand, walk, or sit in scenes as background for the stars' activities. Some extras perform special skills, such as dancing or riding. When in the background, extras often pretend to talk to other extras.
Directors tell the actors and crew how to put the show together.
They may select the cast members and conduct rehearsals. Producers select and finance the show. They also coordinate the activities of the workers. See the Directors specialty for more information. Actors are not the only type of entertainers.