A machine that allows you to run an operating system over another operating system is called: a virtual machine.
What is a Virtual machine?
A virtual machine can be described as the emulation of a computer system which allow an operating system to be run in an app window on a desktop.
Virtual machine can be implemented using specialized hardware, software or both.
Therefore, a machine that allows you to run an operating system over another operating system is called: a virtual machine.
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