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Throughout this book the word ''Virtualization'' is used within the context of running multiple operating systems on a single physical computer system using Xen technology. It is important, however, to appreciate that virtualization is actually a "catch all" term that refers to a variety of different approaches and technologies, of which Xen is but one of many.
When deciding on the best approach to implementing virtualization it is important to have a clear understanding of the different virtualization solutions which are currently available. The purpose of this chapter, therefore, is to describe in general terms the four virtualization techniques in common use today, namely guest operating system, shared kernel, hypervisor and kernel level.
