The word “curtain” refers to a piece of fabric or material that is used to cover a window, divide a space, or provide privacy. Curtains can be drawn open or closed and are often used for decorative purposes, to block light, or to insulate a room. In a theatrical context, a curtain can also refer to the large piece of fabric that hangs at the front of a stage and is raised or lowered to signal the beginning or end of a performance.