Typical curtains for a window Theatre curtains on a small stage (Canberra Albert Hall, 2016) A curtain is a piece of cloth or other material intended to block or obscure light, air drafts, or (in the case of a shower curtain) water.[1] A curtain is also the movable screen or drape in a theatre that separates the stage from the auditorium or that serves as a backdrop/background.[1] Curtains are oft