Why Use virtual Machines ?

Physical Machines :
           > Difficult to move or copy
           > Bound to a specific set of hardware components
           > Often has short life cycle
           > Requires personal contact to upgrade hardware
Virtual Machines :
          > Easy to move and copy
                * Encapsulate into files
                * Independent of physical hardware
          > Easy to manage
                * Isolated from other virtual machines running on the same physical hardware
                * Insulated from physical hardware changes