Definition:
Central Processor Virtualization or Virtualization allows one computer system to emulate as multiple “virtual” computer systems. A Virtual Machine Monitor also known as a hypervisor is a system of system designed to control execution processes of multiple guest operating systems on a single machine. The term host refers to the execution context of the VMM. World switch refers to switching or movement between host and guest. Guest control is the appearance by the user of complete control over all machine systems such as memory, CPU and other peripheral devices (disk, tape, communications, etc.)