A curtain is a piece of fabric that is typically hung on a rod or rail and used to cover a window or doorway. Curtains serve a variety of functions, including providing privacy, blocking out light, and enhancing the decor of a room. They can be made from a wide range of materials, including cotton, silk, linen, and polyester, and can be plain or patterned. Curtains are available in a variety of styles, including: Tab top: These curtains have loops of fabric that are sewn onto the top of the curtain panel, through which a rod or rail is inserted. Grommet: These curtains have metal rings that are sewn onto the top of the curtain panel, through which a rod or rail is inserted. Rod pocket: These curtains have a pocket sewn into the top of the curtain panel through which a rod is inserted. Sheer: These curtains are made from a lightweight, semi-transparent fabric that allows light to filter through while still providing some degree of privacy. Blackout: These curtains are made from a thick, opaque fabric that is designed to block out light and provide maximum privacy.