Entry certificate

An entry certificate is like a special permission slip that says you can go somewhere you normally wouldn't be allowed to go. You need this permission slip because the place might be dangerous or private, and only certain people who are allowed to be there should go there. It's like when your teacher gives you a field trip permission slip so you can go on a cool adventure with your classmates. But, instead of going to a fun place, an entry certificate lets you go to a serious place, like a construction site or a laboratory. The certificate makes sure that you're safe and that you aren't doing anything you're not supposed to do while you're there.