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A virtual machine, or VM, is a software program that exhibits the behavior of a separate computer and is capable of running applications and programs within its own environment.

A virtual machine is usually known as often called a guest. It , because it runs within another computing environment, --usually known as the host. For example, if you install three Linux VMs on a Mac, the Mac is the host machine; the three Linux VMs are guests.

Multiple virtual machines can exist within a single host at one time. In the following examples, one or more virtual machines run on a host machine running OS X. OS X is the primary operating system. The virtual machines (guests) are installed under OS X. The virtual machines run Linux in separate environments on OS X. Thus, your Mac is the "host" machine, and the virtual machines that run Ambari and Hadoop are called "guest" machines.

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