What is a "roller shade"?

A roller shade is a type of window treatment that consists of a fabric panel that is mounted on a roller mechanism and can be easily raised or lowered using a cord or other manual or motorized controls. Roller shades are typically made of materials such as vinyl, polyester, or natural fibers like bamboo or jute, and come in a range of colors, patterns, and opacities to provide varying degrees of light control and privacy.