What is VMWare used for?

VMWare is virtualisation software. In simple terms, VMWare Workstation allows one physical machine to run two or more operating systems simultaneously. The machine on which the Vmware software runs is called the Host Machine. Within this software you can create and run virtual operating systems known as VMImages. The figure below shows two Vmimages of Windows Server 2000 and Windows XP Pro being run on host Windows Server 2003 machine.