A curtain is a piece of cloth or other material intended to block or obscure light, air drafts, or water.
Typical curtains for a window
Theatre curtains on a small stage (Canberra Albert Hall, 2016)
Translucent curtains hung on a window.
Curtains in a window opening to the sea.
Drapery is a general word referring to cloths or textiles. It may refer to cloth used for decorative purposes – such as around windows – or to the trade of retailing cloth, originally mostly for cloth
Curtain
…aesthetics of the window and the room. Curtains can be used to give a room a focal point. There are at least twenty different styles of curtains and draperies which can be used in window treatment. Flat panel curtains are simple and versatile: to make them, pieces of fabric are hemmed on all four edges and…
Funerary stele of a Greek dancer, 400s BC
Portrait of Meryre and Iniuia, 18th Dynasty, c. 1300 BC
Palace servants, Persepolis, 5th-4th century BC