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Virtual machines allow multiple operating systems to run on a single physical hardware platform. They provide isolation between applications and can utilize resources more efficiently.
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A virtual machine represents a complete computer with an operating system and applications as an isolated software environment.
Virtual machines grew from virtualizing computing resources: hypervisors were intended to run multiple isolated operating-system environments on the same physical hardware.
The hypervisor shares CPU, memory, storage, and devices among guests. Each guest sees its own machine even though resources are shared.
A guest operating system runs in the virtual environment.
The hypervisor manages shared hardware resources.
Guests remain logically separated.
Virtual machines support server consolidation, testing, reproducible environments, and running different systems.
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