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A virtual machine is a software implementation of a physical PC or server. Operating systems and applications on physical servers typically only utilize a fraction of the available resources. The hypervisor utilizes all of the physical hardware, separates the virtual machines, and takes advantage of unused resources by sharing them with multiple VMs. Virtualization provides resiliency as guest virtual machines can be moved between hosts in the event of a host failure minimizing or avoiding downtime for the guest virtual machine.
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