Cement is a powdery substance that is used as a binding agent in concrete and other construction materials. It is made by heating limestone, clay, and other materials in a kiln until they fuse together. The resulting clinker is then ground into a fine powder. When cement is mixed with water, it forms a paste that hardens over time. This hardening process is called hydration.
Cement is an essential component of concrete, which is one of the most important building materials in the world. Concrete is used to make roads, bridges, buildings, and other structures. Cement is also used in a variety of other applications, such as making mortar, grout, and stucco.