Okay kiddo, let me tell you about something called "re" complexity in a way that's easy to understand.
You know how sometimes we have to do really hard math problems in school? And some problems are easier than others to solve? Well, "re" complexity is like that for computers.
Basically, it's a way to measure how hard and complicated it is for a computer program to do something. It's like a rating system for difficulty.
The "re" stands for "recursive enumerable." That's just a fancy way of saying that something is possible to solve using a computer program.
So, if something has a low "re" complexity, it means it's pretty easy for a computer to solve. But if something has a high "re" complexity, it means it's really hard and complicated for a computer to figure out how to solve it.
Does that make sense, kiddo?