Curtain is made from various fabrics for sunlight protection into the building and there are many different types of window curtain operation. According to Wikipedia: “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. A curtain is also the movable screen or drape in a theatre that separates the stage from the auditorium or that serves as a backdrop.
Although the words curtain and drape are commonly used interchangeably, drapes distinguish themselves by containing lining sewn onto the reverse side of the fabric. The purpose of the lining is to protect drapes and interior spaces from damaging ultraviolet (UV) rays (UV lining), the rotting of silks, adverse light conditions (dim-out and blackout lining), and fading colored dyes. Linings also provide an immediate aesthetic purpose by adding to the drapeability of the fabric; added weight helps to anchor the drape and creates a more full and luxurious window treatment.”