Functional decomposition

Functional decomposition is like taking apart a big machine and looking at each part of it. Instead of looking at the whole machine, you can look at all the pieces and understand how it works. It's easier to understand the parts than it is to understand how the whole thing works. Whenever you try to solve a problem, you can use functional decomposition to break it down into smaller parts, and then figure out how each part works together to solve the whole problem.