The term 'overclocking' in computing means to improve the performance of a device by altering its speed and specifications. This can sometimes be at the expense of the reliability of the component. Most often the Central Processing Unit (CPU) is the item that is overclocked. Since modifying the speed at which the processor runs increases the amount of heat produced, the use of watercooling or other types of improved cooling systems are needed to ensure the CPU doesn't overheat and burn out.
In addition, lower temperatures for devices like the CPU can actually add to the speed at which it works, as lower temperatures reduce resistance within the CPU itself. At extremely low temperatures, such as that provided by liquid nitrogen cooling, an average home computer can run up to three times faster than normal, although installing cooling equipment to obtain these temperatures is not recommended.