Public-interest immunity is like a secret superhero power that some important people have. Imagine if you had a secret toy that you loved to play with but you didn't want anyone to take it away from you because they might break it or not give it back.
In the same way, some important people have secret information that could help keep people safe, but if that information was made known to others, it could cause a lot of harm. So, sometimes, these important people can use public-interest immunity to keep their information secret.
Think of it like a secret bubble that they can put around their information, to protect it from being seen or heard by people who might misuse it. Just like how you might cover your mouth when you want to tell a secret to your best friend.
But, just like everything in life, there are rules to using this secret superhero power. The people who have this power can't just use it whenever they want, they must prove to other important people, like judges, that keeping their information secret is really important for the safety and well-being of other people.
So, public-interest immunity is like a secret power that can help keep important information safe from harm, but it can only be used if it's really necessary and if it helps keep people safe.