Asbestos is a material that was used a lot in buildings and other things like cars back in the old days. People thought it was useful because it was strong and it could help keep things from catching on fire. But then, they found out that it can be really harmful to people's health if they breathe in the small fibers that come off of it. These fibers can cause problems with people's breathing and even lead to cancer.
So the law got involved to try and keep people safe. Now, in a lot of places, it's illegal to use asbestos in anything new. If a building or something else has asbestos in it, the people in charge have to be really careful about keeping it contained so those fibers don't get into the air. If you're working in a building with asbestos, you might have to wear special clothes and masks to protect you from the fibers.
If someone gets sick because of asbestos, they might be able to take legal action against the people or companies that exposed them to it. The law is there to try and protect people from getting hurt by this harmful material.