When one hears the word curtains, the mind automatically goes to windows. They keep the world outside while maintaining warmth inside and adding style to a room. Curtains are used to enhance a room or to hide or cover a window but they can also be used to separate an area. Curtains are made of different materials - some are sheer, some are of a thicker material, and some have a backing that is called blackout curtains. Curtains can also be used instead of cupboard doors on cabinets.