A showgirl is a female performer in a theatrical revue who wears an exotic and revealing costume and in some shows may appear topless. Showgirls are usually dancers, sometimes performing as chorus girls, burlesque dancers or fan dancers, and many are classically trained with skills in ballet. The term showgirl is also sometimes used by strippers and some strip clubs use it as part of their business name.

A chorus line is a large group of dancers who together perform synchronized routines, usually in musical theatre. Sometimes, singing is also performed. While synchronized dancing indicative of a chorus line was vogue during the first half of the 20th century, modern theatre uses the terms "ensemble" and "chorus" to indicate all supporting players in a stage production.