Domain decomposition

Ok kiddo, imagine that you have a big chocolate cake, but you can't eat it all by yourself. What do you do? You share it with your friends, right? And you can divide the cake into smaller pieces, so that each friend can have their own piece to eat.

Well, that's kind of like what happens with a computer problem that is very big and complex. The computer can't solve it all by itself. It needs to share the work with other computers, just like you shared your cake with your friends. This is called domain decomposition.

The big problem is divided into smaller parts, or domains, that can be solved by different computers. Each domain is like a small piece of the cake that can be assigned to a friend. Each computer works on its assigned domain, and then they share their results with each other until the entire problem has been solved.

This method makes it easier for the computer to solve big problems faster and more efficiently. Just like how you and your friends were able to eat the cake faster and enjoy it more because you shared it.