A chorus is a part of a song that is repeated after each verse, often featuring the main message or theme. It usually has a catchy melody and is designed to be memorable, encouraging listeners to sing along. In many songs, the chorus contrasts with the verses, providing a sense of unity and familiarity. In theater, a chorus refers to a group of performers who comment on the action of a play, often through song and dance. This practice dates back to ancient Greek theater, where the Greek Chorus provided context and insight into the story, enhancing the audience's understanding of the characters and events.