Cement is a fine powder made from a mixture of limestone, clay, shells, and silica, which is heated to a high temperature to form clinker and then ground into a powder. It serves as a binder in construction, combining with water to form a paste that hardens over time. When mixed with sand, gravel, or other aggregates, cement creates concrete, a versatile and durable material used in the construction of buildings, roads, bridges, and other infrastructure. Cement is known for its strength, durability, and ability to withstand various environmental conditions.