Okay kiddo, so imagine you have some friends at school. You might notice that your friends have certain things in common, like they all like playing soccer or they all like purple. That's kind of like a group!
Now, imagine there's a special kind of group where all the friends have something in common that's very simple. It's like they all just really like eating bananas or they all just have the same favorite color. This group is called a "characteristically simple group."
It's like a special club where everyone is super similar in one specific way. And because this similarity is so simple, it makes it really easy to understand and explain what the group is all about!