Hibernation

Sleep vs Hibernation: Power Use and Resume State

Closing a laptop lid can make the machine appear to be off, yet opening it a few minutes later may restore the desktop almost instantly. A computer placed into hibernation can also restore open applications, but the mechanism is different. The distinction affects power use, resume time, storage activity, and what happens if the battery becomes depleted. Both modes preserve more session state than a normal shutdown. They differ mainly in where that state is kept while the computer is inactive.