To simulate hardware functions and build a virtual computer system, virtualization needs virtualization software or Hypervisors.
A hypervisor also called a Virtual Machine Manager (VMM) is a layer between the physical server and the virtual machine. It separates the hardware resources like CPU/processor power, RAM, network bandwidth, etc. from virtual machines and distributes the physical resources to the virtual machines. It is a program that isolates, partitions or abstracts the VMs to run without any interruptions of resource outages.
