Okay kiddo, imagine you have a magic backpack that can store all your toys and snacks. Now, imagine you have a special toy that needs a special kind of snacks to work properly. But, the backpack can't carry that special snack because it doesn't have a pocket for it!
This is kinda like the problem with computers. They have a special part called the graphics card that makes videos and games super cool, but sometimes they need to upgrade it to make it work even better. And when they upgrade it, they need to plug it into the computer in a special way. That's where a Mobile PCI Express Module (or M.2) comes in!
An M.2 is like a special pocket in a computer where you plug in the upgraded graphics card. It works kinda like a backpack for toys, but just for computer parts! The M.2 has its own little computer brain to help it talk to the other parts of the computer and make sure everything works together.
So, when you upgrade your computer's graphics card with an M.2, you're giving it a special pocket to plug into, and making sure it has the brainpower to talk to the other parts of the computer. And just like how your magic backpack gives your special toy the special snacks it needs to work its best, the M.2 helps your graphics card work its best too!