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Hypervisors

A hypervisor, also known as a virtual machine monitor (VMM), is software that creates and manages virtual machines (VMs) on a host system. Hypervisor allows multiple operating systems to run concurrently on a single physical machine by abstracting the hardware resources. There are two types of hypervisors.

1. Type 1 - Type 1 Hypervisor (Bare-Metal): Runs directly on the hardware without a host operating system. At times, Type 1 hypervisor is embedded in machine's firmware.  These are used in Data centers, Cloud or enterprise computing. Examples include VMware ESXi, Microsoft Hyper-V, and Xen.
2. Type 2 - Type 2 Hypervisor (Hosted): Runs on top of a conventional operating system. These are used in Desktop and Development environments. Examples include VMware Workstation, Oracle VirtualBox, and Parallels Desktop.