Okay kiddo, so you know how sometimes you have to use different toys to do different things? Well, computers are kind of like that too - they need different parts to do different jobs.
One of the most important parts of a computer is its brain - the thing that does all the thinking and calculations. And in some computers, like those made by a company called AMD, that brain is called an APU.
APU stands for "Accelerated Processing Unit," which is just a fancy way of saying that it's really good at doing lots of different things all at once. It has lots of different parts inside of it that each specialize in different tasks, like running programs, playing games, and making videos.
The cool thing about APUs is that they don't just have a regular brain inside of them - they also have something called a graphics processor. This is like a special part of the brain that only focuses on making pictures and video look really good.
So, when you have an APU in your computer, it can do lots of different things all really well - it can run programs and play games and make videos, and it can do all of that while also making everything look really pretty. Pretty cool, huh?