This is the art of increasing the speed of the processor by using different voltage. There are also a few other tricks. Often by doing this overclocking, the processor speed will be increased by intense, sehingg apecinta game or those who delighted in doing things with the hardware tooling is often a slow and buy chips overclock to improve their performance, even dapa expensive than processor speed.
This applies not only to the CPU. Many graphics cards can also be overclocked.
But keep in mind is that it also contains dangers overclock. Chip can be easily damaged because forced to perform well above the performance specifications.