Virtualization is the process of presenting a set of computing resources (such as computing
power or data storage) so that they can call be accessed in ways that are not restricted by
physical configuration or geographic location. Virtualization enables a single physical
resource (such as a server or a storage device) to appear to the run many instances of
resources. For example, a server or mainframe can be configured to run many instances of
an operating system so that it acts like many different machines. Virtualization also enable
multiple physical resources (such as storage devices or servers) to appear as a single logical
resource, as would be the case with storage area networks or grid computing. Virtualization