A CPU cooler is designed to draw heat away from the CPU and other components in the enclosure. Using a CPU cooler to lower CPU temperatures improves efficiency and stability of the system. Air CPU Coolers may consist of a heat sink (a part designed to lower the temperature of an electronic device by dissipating heat into the surrounding air) or combination of a heat sink and fan. These cooling systems are generally referred to as air cooling and are used to improve airflow. Another type of CPU cooling is called liquid cooling, where liquid circulates through small pipes in a heat sink, drawing heat from the CPU to a dedicated radiator located on the system cabinet or enclosure, where it is released into the ambient air outside of the CPU. The cooled liquid travels back through the system to the CPU to continue the process.