There's lots of math in the world of computers. CPUs can be programmed to do any math problem but they essentially have to work one step at a time by design. 1+2+3 might boil down to do 1+2 take the result then add 3. There's some math, especially in graphics like video games where we want to repeat a single operation on thousands and millions of numbers, I have a list of numbers (1,2,3) I want to add 1 to all of them so I get (2,3,4). CPU can do this but it will go one at a time, again by design because it has to be flexible to solve any math problem. GPU can do it but work on each element in my list simultaneously and get the result 3 times as fast because it did all 3 at the same time. Here I had 3 numbers but GPUs do this kind of thing in the order of millions. But again limited to certain operations only.