Which organ is known as the largest organ in the human body?

The skin is recognized as the largest organ in the human body due to its extensive surface area and critical functions. It plays vital roles in protecting internal organs, regulating temperature, and facilitating the sensation of touch, pain, and pressure. The skin also acts as a barrier against pathogens and helps to prevent dehydration, making it essential for overall health and survival.

While the liver, heart, and brain are all crucial organs with significant roles in bodily functions, they do not surpass the skin in size. The liver is the largest internal organ, the heart is pivotal for circulating blood, and the brain is essential for processing information and regulating bodily functions, but none approach the size and surface area of the skin. Thus, in terms of both area and function, the skin qualifies as the largest organ in the human body.