Group key

A group key is like a secret code that allows a group of people to talk to each other privately. Imagine you and your friends want to have a secret club where you only talk to each other and not let anyone else know about your plans. You can create a secret code that only you and your friends understand. This code is like a group key. When you use this code, only the people in your group will be able to understand what you're saying. It's like magic! This way, you can keep your secret club activities private and no one else can interfere.