The primary function of the skin is to serve as a protective barrier for the body. Acting as the largest organ, it defends against environmental hazards, such as pathogens, UV radiation, and chemical exposure. Additionally, the skin aids in regulating temperature through sweat production and retains moisture to prevent dehydration. It also contains sensory receptors that allow individuals to feel touch, pain, and temperature, contributing to overall awareness of the environment. Beyond protection, skin plays a vital role in the immune response and synthesizes vitamin D when exposed to sunlight, supporting overall health.