Mortar is a type of paste or mixture used in construction as a bonding agent between bricks, stones, or other masonry units. It acts as a binding material that holds the masonry elements together and provides structural stability. Mortar is typically made by mixing cement, sand, and water in specific proportions, although there are various types of mortar available depending on the specific application. The consistency of mortar can range from thick and stiff to more fluid, depending on the desired strength and workability. It hardens over time through a process called hydration, where the cement particles react with water to form a solid and durable bond. Mortar is essential in masonry construction for building walls, chimneys, foundations, and other structures.