Portland cement is a common type of cement used in construction. It is made by heating a mixture of limestone and clay in a kiln, which produces clinker. This clinker is then ground into a fine powder and mixed with a small amount of gypsum to control the setting time. This cement is known for its strength and durability, making it ideal for various applications, including concrete, mortar, and stucco. When mixed with water, Portland cement forms a paste that hardens over time, providing a solid foundation for buildings, roads, and other structures.