Okay kiddo, let's start with what lead paint is. When people wanted to paint their houses many years ago, they used a type of paint that contained a material called lead. This paint looked nice and shiny, but it was not safe for people to be around because lead is a kind of poison.
If you touch or swallow lead paint, it can hurt your body and make you feel sick. It's like eating something that's not good for you - it can make you feel bad. For this reason, lead paint is not used anymore because people know it's dangerous.
Nowadays, when we want to paint our houses, we use safer and healthier types of paint that don't have lead. This is much better for our bodies and helps us stay healthy. So, always remember to stay away from old buildings that might have lead paint and let a grown-up know if you see any paint that looks really old or flaky.