A curtain (sometimes known as a drape, mainly in the United States) is a piece of cloth intended to block or obscure light, or drafts, or water in the case of a shower curtain. Curtains hung over a doorway are known as portières. Curtains are often hung on the inside of a building's window to block the passage of light, for instance at night to aid sleeping, or to stop light from escaping outside the building
