The largest organ of the human body is the skin. It plays a vital role in protecting the body from external elements, regulating temperature, and facilitating the sensation of touch. Comprising three primary layers—epidermis, dermis, and subcutis—skin serves as a barrier against pathogens and physical injuries. Furthermore, it aids in the production of vitamin D when exposed to sunlight. An average adult human’s skin can cover an area of about 1.5 to 2 square meters, making it not only the largest organ but also one of the most functionally essential.