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In the last half century, microcomputers have become increasingly powerful. Server systems have grown so powerful, that many enterprise servers typically are underutilized. Modern computers are sufficiently powerful to use virtualization to present the illusion of running many virtual systems on a single machine. Each virtual system runs a separate operating system instance simultaneously. So, you can run multiple instances of Linux at the same time on the same machine, or you can run combinations of operating systems, such as Linux, FreeBSD, Windows and so on. This has led to a resurgence of interest in Virtual Machine (VM) technology, which has been around for decades on bigger iron

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