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== Overview ==
 
== Overview ==
As with everything in life, the microprocessor doesn't experience consistent heavy workload at all times. In fact, more often than not, for the typical user, the microprocessor ends up executing very little if nothing at all. An '''idle CPU''' is a CPU that doesn't do any useful work. Much like when you shut the lights when you leave a room, since the CPU is not doing any useful work it can be momentarily turned off.  
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As with everything in life, the microprocessor doesn't experience consistent heavy workload at all times. In fact, more often than not, for the typical user, the microprocessor ends up executing very little if nothing at all. An '''idle CPU''' is a CPU that doesn't do any useful work. Much like when you turn off the lights in a room when no one is there, since the CPU is not doing any useful work it can be momentarily turned off.  
  
Because of the complexity of modern microprocessors - incorporating [[multi-core microprocessor|multiple]] [[physical core|cores]], [[caches]], and other components, there are multiple C-states depending on which part of the system is talked about. In practice there are usually 3 general C-states:
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Because today's processors are complex made of multiple cores, caches, and other components, there are multiple C-states depending on which part of the system is talked about. In practice there are usually 3 general C-states:
  
 
* '''CC-states''' - a set of idle states provided by the hardware controlling the idle states of a physical core.
 
* '''CC-states''' - a set of idle states provided by the hardware controlling the idle states of a physical core.

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