Now more an more everyone is trinyg to cut cost, become more efficient and get more done with less money.And what better way to do this than virtualise, it used to be the way that virtual machines , which by the way are noot a new idea (IBM came up with the concept many years ago for mainframes).
Virtual Machines were slow fragile and time consuming to set up , now vmware has matured to be the industry leader at time of writing with products like vmware fusion , vmware workstation , vmware esx server and vmwre player, it is now a brighter pleasant experience to work with for virtualising and cloning multiple servers , the phrase P 2 V you may hear repeatedly this means physical to virtual , they offer a tool that basically virtualises your real machine into a VM, and very good it is too.
Some of these technologies you can use for free, and now the marketplace has grown up there are many competitor products such as virtualcenter and Oracle VM Virtualbox, KVM , Hyper-V
http://en.wikipedia.org/wiki/Comparison_of_platform_virtual_machines
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