There isn’t any doubt, the two options are provided for two different purposes. I am sure, the options are self-explanatory, but what about the sleep and hibernate! If the hibernate option is greyed out, you can learn how to enable hibernation Windows 10 and other Windows versions, here. Two of them are shut down or power off, and the restart.
Expanding the ‘Power’ menu in Windows 10 or any other previous versions of Windows, open up a few options.
