The largest organ in the human body is the skin. It serves several vital functions, including protecting internal organs, regulating temperature, and allowing sensory perception. Covering the entire body, the skin is composed of multiple layers: the epidermis, dermis, and subcutaneous tissue. The skin also plays important roles in immune response and helps to synthesize vitamin D when exposed to sunlight. Its health is crucial for overall well-being, with various factors like hydration, nutrition, and protection from harmful substances affecting its condition. Comprehensive skincare is essential for maintaining its integrity and function.