Gristle is a type of connective tissue found in animals, usually in the form of CARTILAGE. CARTILAGE is a firm but flexible tissue that is composed of specialized cells called chondrocytes and an extracellular matrix that includes collagen and elastin fibers. It is most commonly found in the joints, ears, nose, and throat. CARTILAGE provides structure and support to the body, and it also helps absorb shock and reduce friction between bones.