ELI5: Explain Like I'm 5

Substance of very high concern

Okay, imagine you have a toy that you really love to play with. But one day, you learn that the toy is made of some special materials that can be very bad for your health or the environment around you. These materials are called "substances of very high concern".

It's kind of like when you eat too much candy and your parents tell you that it's bad for your health. Some substances can be really bad if they get in your body, or if they get in the air or water around you.

So, people who make things like toys, clothes, or electronics have to be very careful about what materials they use. They have to make sure that they don't use substances of very high concern, because they don't want to make people or the planet sick.

That's why there are rules and laws that tell companies what substances they can and can't use. It's all to keep us safe and healthy.