Platform Virtualization
In computing, virtualization is a broad term that refers to the abstraction of computer resources.
In computing, platform virtualization is a virtualization of computers or operating systems. It hides the physical characteristics of computing platform from the users, instead showing another abstract, emulated computing platform.
Platform virtualization is performed on a given hardware platform by host software (a control program), which creates a simulated computer environment, a virtual machine, for its guest software. The guest software, which is often itself a complete operating system, runs just as if it were installed on a stand-alone hardware platform.
In case of server consolidation, many small physical servers are replaced by one larger physical server, to increase the utilization of costly hardware resources such as CPU. Although hardware is consolidated, typically OSes are not. Instead, each OS running on a physical server becomes converted to a distinct OS running inside a virtual machine. The large server can "host" many such "guest" virtual machines.
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