The term 'Performance Extras' refers to individuals who are hired to appear in a theatrical production, such as a play or musical. The job of a Performance Extra is to provide additional support to the main cast and crew, often by providing crowd scenes or other background action. The term 'ENCORE' is used to describe an additional performance given after the main show has ended, usually in response to audience demand. Performance Extras are often hired to provide additional support during encores.