The human body's largest organ is the skin. Covering the entire body, skin serves various essential functions, including protection, regulation of body temperature, and sensation. It acts as a barrier against pathogens, chemicals, and physical impacts, while also preventing water loss. The skin is composed of multiple layers, primarily the epidermis, dermis, and subcutaneous tissue, each fulfilling different roles. In addition to its protective functions, skin also plays a crucial part in the synthesis of Vitamin D when exposed to sunlight. The health of the skin is an important indicator of overall well-being.