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Throughout this book the word ''virtualization'' is used within the context of using Xen technology to run multiple operating systems on a single physical computer system. It is important, however, to appreciate this that virtualization is actually a "catch all" term that refers to a variety of different solutions and technologies, of which Xen is only one.
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.
