Wall plaster is a type of building material used to create a smooth, even surface on walls and ceilings. It is typically made from a combination of cement, sand, and water, and can be applied in two ways: with GROUT (a mixture of cement, sand, and water) or with STUCCO (a mixture of cement, sand, lime, and water). GROUT is usually used for smaller areas, while STUCCO is used for larger surfaces. Both materials are durable and provide a strong, attractive finish.