What is CPU & GPU in computers?

GPU (graphics processing unit) CPU, is core of the computer which processes the data as per the instructions given by the user. But when it comes to the heavy graphics processing, it tend to slow down. To combat this situation GPU was designed, whose sole purpose was to process graphics and in return lessen the burden on the CPU making it more faster and deliver better performance.
From the user’s perspective, the application just runs faster because it is using the high-performance of the GPU to boost performance.