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I wonder how virtualization software such as VirtualBox or VMWare Workstation works? How can they create a virtual environment that is taken as a separate computer by operating systems? I'm almost sure the answer to this question is very deep, but I'd be well satisfied with basic theory.
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Virtualization uses software to create an abstraction layer over computer hardware that allows the hardware elements of a single computer—processors, memory, storage and more—to be divided into multiple virtual computers, commonly called virtual machines (VMs).
A virtual machine is a computer file, typically called an image, that behaves like an actual computer. It can run in a window as a separate computing environment, often to run a different operating system—or even to function as the user's entire computer experience—as is common on many people's work computers.
Server virtualization is the process of using software to divide physical hardware into separate unique virtual servers. Read about the three main types of server virtualization: full-virtualization, para-virtualization, and OS-level virtualization.
How does VMWare work: http://www.extremetech.com/article2/0,2845,1624080,00.asp
How does virtualizaton work: http://blog.tmcnet.com/voip-enterprise/tmcnet/how-does-virtualization-work-and-why-is-now-a-good-time-to-check-it-o.asp
Server Virtualization FAQ http://www.itmanagement.com/faq/server-virtualization/
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