VMS (Virtual Memory System) is an operating system from the Digital Equipment Corporation (DEC) that runs in its older mid-range computers. VMS originated in 1979 as a new operating system for DEC's new VAX computer, the successor to DEC's PDP-11. VMS is a 32-bit system that exploits the concept of virtual memory.

Do VMs have their own OS?

Each VM is completely isolated from the host operating system. Also, it requires its own OS, which can be different from the host's OS. Each has its own binaries, libraries, and applications.

How does virtual machine work in operating system?

VMs are made possible through virtualization technology. Virtualization uses software to simulate virtual hardware that allows multiple VMs to run on a single machine. The physical machine is known as the host while the VMs running on it are called guests. This process is managed by software known as a hypervisor.