The largest organ in the animal body is the skin. In humans, the skin serves as a protective barrier, covering the entire body and playing a vital role in several functions, including temperature regulation, sensation, and immunity. It consists of three main layers: the epidermis, dermis, and subcutaneous layer. The skin's size varies between individuals but can account for about 16 percent of a person's total body weight. Skin protects underlying tissues from physical injury, harmful pathogens, and dehydration, making it essential for overall health and well-being.