Some actors employed by theater companies teach acting in courses offered to the public. In addition to the actors with speaking parts, extras, who have small parts with no lines to deliver, are used in almost all motion pictures, in many television shows, and in some theater productions. Directors interpret plays or scripts. In addition, they audition and select cast members, conduct rehearsals, and direct the work of the cast and crew. Directors use their knowledge of acting, voice, and movement to achieve the best possible performance and usually approve the scenery, costumes, choreography, and music.
Producers are entrepreneurs.
They select plays or scripts, arrange financing, and decide on the size of the production and its budget. They hire directors, principal members of the cast, and key production staff members, and they negotiate contracts with artistic personnel, often in accordance with collective bargaining agreements. Producers also coordinate the activities of writers, directors, managers, and other personnel. Employment in motion pictures and films for television is centered in Hollywood and New York City. Acting demands patience and total commitment, because actors must wait for parts or filming schedules, work long hours, and often travel.