Water cooling is a cooling method used to keep the temperature of primary system components, such as processors and graphics cards, as low as possible. Water conducts heat about 30 times faster than air, so a water cooling system allows your system to run at higher speeds whilst keeping it cool and reducing system noise.
Water cooling systems are simple in concept but require more work than a traditional air cooler or all-in-one liquid cooler. A pump is required to circulate water through a water block attached to the components that need cooling. Heat is transfered to the water, where it flows to a radiator which expels the heat into the air surrounding the computer. The cooled water is then pumped back through the system.