Plaster of Paris is a white powder made from gypsum, a naturally occurring mineral. It gets its name from the large gypsum deposits found in the Montmartre district of Paris, France. When mixed with water, Plaster of Paris forms a smooth and workable paste that can be molded into various shapes. Once it dries and hardens, it becomes a solid and durable material. Plaster of Paris casts are popular due to their ability to conform to the contours of the body, providing an excellent fit and support. They are relatively inexpensive, easy to apply, and do not require any special equipment for removal.