Gypsum building plaster is a material used in construction as a finish coating for walls and ceilings. It is made up of gypsum powder, water, and additives such as bonding agents, fiber reinforcement, and acrylics. When mixed with water, the gypsum powder forms a paste that can be applied to walls and ceilings using a trowel or sprayer. Once dried, gypsum building plaster provides a smooth, white surface that can be painted or textured. It is commonly used in interior construction due to its fire-resistant, sound-insulating, and mold-resistant properties.