Runs directly on the hardware.
This makes it essentially an OS.
Type 1 video
This is a program that runs in an underlying OS. For example,
Parallels runs on MacOS, and allows Windows or Linux to run on
it.
Also called hosted hypervisors.
It installs a guest OS by pretending it is a machine being
booted for the first time, and installing the OS from media,
onto a "disk" (that is really an ordinary OS file).
Type 2 video
1. b; 2. a; 3. b;