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Server virtualization upends this serial relationship. With server virtualization, a
hypervisor dynamically creates multiple, isolated software instances, or virtual machines
(VMs), on a single server. This abstraction allows multiple workloads to simultaneously
share the server's resources. By interleaving the ebb and flow of multiple workloads,
server utilization rates can be dramatically and permanently improved. In addition, server
sprawl can, for a period of time, be reversed.