What is the largest organ of the body?

The skin is recognized as the largest organ of the body, playing a crucial role in protecting internal structures from the outside environment. It serves multiple functions, including regulating body temperature, allowing for sensation (touch, heat, and pain), and providing a barrier against pathogens. Covering an average adult's body, skin can account for about 15% of total body weight and provides a physical barrier that helps prevent dehydration and infection.

While the heart, liver, and brain are vital organs with their specific functions—circulating blood, detoxifying substances, and processing information, respectively—they do not match the overall size and surface area that the skin encompasses. Hence, when considering the largest organ, skin stands out distinctively in both mass and coverage.