Commit 82fbee8

@@ -30,4 +30,12 @@ Hypervisor implementations vary:
 
 * type 0 hypervisor: hardware based solutions that provide support at the firmware level.
 * type 1 hypervisor: OS like software built to provide virtualization.
+* type 2 hypervisor: are applications that run on other operating systems, which do not know that virtualization is taking place.
 
+VCPU: virtual CPU.  does not execute code but represents the state of the CPU as the guest machine believes it to be.
+
+## Summary
+
+Virtualization is a method of providing a guest with a duplicate of a system's underlying hardware.
+Multiple guests can run on a given syste, each believing it is the native operating system in full control
+of the system.