Final answer:
A virtual machine is an operating environment that enables applications to run in isolation and execute multiple applications on one computer system.
Step-by-step explanation:
An operating system that enables applications to run in an isolated fashion and provides the ability to execute multiple applications on one computer system is called a virtual machine (VM).
A VM creates a virtual environment separate from the underlying hardware, allowing for efficient allocation of resources and isolation of applications. Examples of VM software include VMware and VirtualBox.
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