CPU can do everything. It's one really smart and hard working guy just going off of endless instructions.

GPU is a collection of smart fast hard working guys all given portions of specific instructions and are told to start working at the same time.

Another analogy - CPU is me remodeling bathroom step by step in an apartment building. When done, I move to next one.

GPU is a bunch of guys all assigned small tasks all located in designated bathrooms in the apartment building.

Which one is overall faster?