Okay kiddo, imagine a big performance like a musical or a play. The chorus girls are the dancers who work together in a group to help tell the story through their movements and singing. They wear sparkly costumes and practice for hours to make sure they dance in time with each other and the music. When you watch a show, you might see them in the background dancing and singing while the main characters do their thing in the spotlight. They are an important part of the show, just like all the other actors, singers, and dancers.