GPU (Graphics Processing Unit) or also know as the VPU (Visual Processing Unit) is a graphics device rendered in personal computers, workstations and game consoles. GPUs are used for manipulating and displaying computer graphics and are more efficient than CPUs. It is a highly parallel structure which used for a range of complex algorithms.

If you want to no more on GPU, the link is below:

• http://en.wikipedia.org/wiki/Graphics_processing_unit