The primary material used to make bricks is clay. Clay is a natural resource formed from finely grained minerals and can be molded when wet. When this material is heated in a kiln, it hardens and becomes durable. This process, called firing, not only strengthens the clay but also gives bricks their distinctive characteristics. Bricks made from clay are versatile and are commonly used in construction for walls, pavements, and other architectural features due to their longevity and insulating properties.