Cartilage is a type of connective tissue found in many parts of the body, including the nose, ears, and joints. It is composed of collagen fibers and a firm gel-like substance called chondroitin sulfate. The term 'GRISTLE' is often used to refer to cartilage, as it is a tough, fibrous material that can be difficult to chew. Cartilage provides structure and support to the body, and helps to cushion and protect bones and joints.