Vmkernel can be run as a kernel, which is the case with ESXi; it can be loaded as a kernel module. The latter requires a different kernel, for instance, a linux kernel. So, it boils down to the scope of the word OS in different contexts: guest OS, host OS, etc. On Fri, Apr 30, 2010 at 2:11 PM, dd yakkali <dd.yakkali@xxxxxxxxx> wrote: > Hello everyone, > > I am new to this virtualization world. I want to get more information about > this. > > I always thought that Virtualization software needs a base OS to run on. > Once you have the virtualization software installed on a host OS, you can > create any virtual machine/OS using the virtualization software. > > Am I correct in stating this? > > Thanks > Deen >