Okay kiddo, imagine you have a lot of toys in your room and you want to make sure they don't get lost or broken. So you put them in a special toy box and make sure the lid is closed tightly.
Now, imagine that your toys are like important information that grown-ups have to keep safe. Sometimes, they put that information in a computer or on the internet, so they need to make sure it's safe too.
A coverage noticer is like a special toy box for that important information. It's a program that checks to make sure that the information is safe and protected. It looks for things like passwords and security settings and lets the grown-ups know if anything needs to be fixed or changed to keep the information safe.
Just like how you check your toy box to make sure none of your toys are missing or broken, a coverage noticer checks the important information to make sure it's all there and not in danger of being lost or broken.