Drywall is a wall-and-ceiling material made of gypsum (also known as plaster of Paris) and sometimes cellulose and/or paper fibers. It is a lightweight, inexpensive, and easy-to-use material that can be used for a variety of purposes, including interior partitions, exterior walls, ceilings, or for sound-deadening. It is often used for drywall construction, soundproofing, and other applications when interior partitions and walls are required.