Virtual machine (VM) is an imitation of a computer system which is based on computer architectures and behave like a separate computer systems, complete with virtual hardware devices. It provide same functionality as a physical computer. Virtual machines include virtual desktop infrastructure, application runtime, and backup software systems. VM are computer files that run on a physical computer. A virtual machine is known as a guest, created within a computing environment, called a host. Multiple virtual machines can exist in one host at one time. Virtualized servers, applications, and other machines are leveraged by users for scalable and versatile functionality.