Standby and Hibernate both save you from having to log off and shut down to save power when you quit using your PC for a few minutes, a few hours, or longer. Many PC users don't understand the difference between Standby and Hibernate, and when to use each of them. Typically, if you plan to be away from your computer for a short while during your workday, put your computer on Standby, which places your entire system in a low-power state. Hibernate puts PCs into an even deeper sleep than Standby mode. Put your computer in Hibernate when you will be away from the computer for an extended time or overnight.
Hibernation is just short of a complete shutdown.
When a PC goes into hibernation, Windows saves your desktop state with all open files and documents before powering down your computer. To start working again, simply press the power button and logon normally. Your computer starts more quickly because it skips steps such as cache cleanup. When Windows brings your PC out of hibernation, you'll find your documents and files open on your desktop exactly as you left them. Hibernate is a fast way to save your work when you want to go home at night.