Cob is a traditional building material made from a mixture of clay, sand, straw, and water. It is often used to create walls for homes and other structures. Cob is known for its excellent insulation properties and durability, making it a sustainable choice for construction. The process of building with cob involves shaping the mixture into large lumps or blocks, which are then stacked and sculpted to form walls. This technique has been used for centuries in various cultures, particularly in regions with abundant natural resources. Cob structures can be found in places like England and Morocco.