Human skin is the largest organ of the body, serving as a protective barrier against environmental factors such as bacteria, chemicals, and temperature changes. It consists of three main layers: the epidermis, which is the outer layer, the dermis beneath it, and the hypodermis or subcutaneous layer, which contains fat and connective tissue. The skin also plays a vital role in regulating body temperature and providing sensory information through nerve endings. It contains melanin, which gives skin its color and protects against ultraviolet (UV) radiation from the sun. Proper care of the skin is essential for overall health.