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A hypervisor—also known as a virtual machine monitor (VMM)—is one of the different types of virtualization software layers that creates and runs virtual machines (VMs) by separating a host computer’s software from its hardware.
Using a hypervisor, multiple VMs (guest machines) can function alongside one another while utilizing the physical computing resources from the same computer (host machine). One of the two main types of hypervisors is known as a bare metal or Type 1 Hypervisor. This type of hypervisor is installed directly on the hardware of a physical host machine. The other type of hypervisor, generally called an operating system (OS)-level virtualization or Type 2 Hypervisor, is installed as a program on a host operating system.