A piece of software that runs and manages virtual machines is known as a Hypervisor.
Software that builds and manages virtual machines is called a hypervisor, also referred to as a virtual machine monitor or VMM (VMs). By essentially sharing its resources, such as memory and computation, a hypervisor enables a single host computer to handle numerous guest virtual machines (VMs). The host operating system gains a new software layer from a hosted hypervisor, while the guest operating system moves up to a third software level above the hardware. Oracle VM VirtualBox is a well-known example of a hosted hypervisor.
Type 1 hypervisors run on the system hardware directly; this is known as a "bare metal" embedded hypervisor.
Type 2 hypervisors run on a host operating system that offers virtualization features like memory management and I/O device support.
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