What is "underclocking"

n. (context computing English) The deliberate reduction of the speed of a CPU, often to reduce power consumption vb. (present participle of underclock English)

Underclocking, also known as downclocking, is modifying a computer or electronic circuit's timing settings to run at a lower clock rate than is specified. Underclocking is used to reduce a computer's power consumption, increase battery life, reduce heat emission, and it may also increase the system's stability and compatibility. Underclocking may be implemented by the factory, but many computers and components may be underclocked by the end user.