Answer without Google… What’s the largest organ in the human body? Most people immediately start thinking about the liver, lungs or even the brain—but the answer is actually the skin. Medical sources including Cleveland Clinic and the NIH identify skin as the body’s largest organ.

Your skin isn’t simply an outer covering. It forms a protective barrier against germs, chemicals, sunlight and physical injury, while also helping prevent excessive water loss. It contains nerves that allow you to sense touch, pressure, temperature and pain, making it an important sensory organ as well.

The skin also plays a major role in regulating body temperature. Blood vessels in the skin can change how much heat escapes from your body, while sweat helps cool you down. It also participates in vitamin D production when exposed to sunlight. The skin itself consists of three main layers: the epidermis, dermis and hypodermis.

And here’s the part that surprises many people: skin can account for roughly 15% of your total body weight, while an average adult has several kilograms of skin covering a large portion of the body’s surface. So, if you answered “the liver,” you weren’t completely off—the liver is the largest internal organ. But for the entire human body, the correct answer is SKIN.