Melanin is something that helps make people's skin and hair different colors. Some people have a lot of melanin and their skin is darker, while others don't have as much and their skin is lighter.
Melanin is made in little cells called melanocytes that live in your skin. When your skin gets sunburned or tans, it's because the melanocytes are making more melanin to protect your skin from the sun.
Melanin is really important for keeping your body healthy. It helps protect your skin from damage and can even help prevent cancer. That's why it's important to wear sunscreen when you go outside!