Virtual machine is a software implementation that executes and runs an operating system like a physical machine, and any program can run on this new machine.
Virtual machine provides various advantages over the installation of OS. Mainly, virtual machines for different emulators and in cloud-based architecture provide total isolation, and a complete isolation ensures that any services or packages are not affecting your main OS. Moreover, you can easily create, delete, export, and import different environments. Many large hosting providers use virtual machines for backups, disaster recovery, deployments, and administration tasks.
Operating system tasks such as CPU usage, memory, hard disk, and USB are managed by the virtualization layer. The virtualization layer translates these requests to the underlying hardware layer.
Mainly, virtual machines are classified into two levels based on their use. They are explained in the following sections.