A chin is the protruding part of the face located below the mouth, formed by the lower jawbone, known as the mandible. It plays a crucial role in human facial structure and aesthetics, contributing to the overall shape of the face. The chin can vary in size and shape among individuals, influenced by genetics and development. Chins can be classified into different types, such as prominent or recessed. A prominent chin extends outward, while a recessed chin appears less pronounced. The appearance of the chin can also be affected by factors like aging, weight changes, and dental health, impacting both function and appearance.