Ever since Windows 8, Windows is able to perform various types of shutdown operations. In addition to the classic hibernation and shutdown operations, Microsoft added a hybrid shutdown called "Fast Startup". The Fast Startup combines the hibernation of the OS kernel with logoff. So it reduces the next boot time by allowing the operating system to start significantly faster yet logs in to a fresh user session. If you are interested in knowing what your last operating system's shutdown type was (fast startup, normal shutdown or hibernation), here is how you can see that information in Windows 10.