Okay, so imagine you and a bunch of your friends want to do something together, like play a game. But, your friend Timmy said that he doesn't like playing games with lots of people, so he wants to play his own game separately. That's kind of like a class action waiver.
In grown-up terms, a class action waiver is when a company or organization says that you can't bring a lawsuit against them with a big group of people (like a class action) and instead you have to individually sue them on your own. It's kind of like Timmy wanting to play his own game instead of playing with everyone else.
The reason companies might want to do this is because it's usually easier and cheaper for them to deal with one lawsuit at a time instead of a big group of people all suing them at once. But, for people who were wronged by the company, it might be hard or too expensive for them to sue on their own, which is why class actions can be helpful for them.
So, that's what a class action waiver is. It's like Timmy wanting to play his own game instead of playing with everyone else, but instead it's a company saying you have to sue them individually instead of in a big group.