What is GPU in mobile phones?

Answer 1

GPU in mobiles like PC's/Macs/Laptops stands for "Graphics Processing Unit".

This is the devices "Graphics card". Due to the size factor of phones the graphics chip (GPU) is often combined with the CPU (Central Processing Unit) which is the "core/brain" of the system.

The GPU has its own form of RAM (Random Access Memory) which is optimized for processing visual content on the screen rather than standered programs where the CPU only has to process keyboard input/window switching/button clicks and the like.

Of course the CPU still has to do a lot of work alongside the GPU, but without the GPU games would still look like the old super Mario games and fully text based games like alot of the old C64 and lower gen systems.