Xen is an open source software project that provides high-performance virtualization. It allows multiple operating systems to run concurrently on a single physical computer. So using Xen, we can run different opreating systems at the same time on a single machine. Part of the reasons for the popularity of Xen are the number of different operating systems which are supported and the wide variety of applications that can be run on it. Some of the benefits of Xen which I feel are important are the application mobility support, the security and privacy features which are supported and so on. One of the most useful features in version 3.0 is the support for hardware virtual machines and the support for reusing other open source projects like emulated BIOS and so on.
I am not much of a virtualization groupie, but I have used VMWare before, and it was very useful for me when I wanted to switch between using windows-linux applications and I didn't want to run Cygwin in my lab machine. I haven't tried Xen but I will do so, now that I am very impressed by the inherent advantages that it possesses like the architecture built on the conept of distrust and so on. The second point is that Xen has benefited widely from its use of the Linux operating system (especially in its early days),and with the support from major players in the market, it has only grown in stature.
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