In some cases you may be required to install Mac OS on a virtual machine, for example, if you need to test applications that can only be run on Mac OS. Hardware virtualization allows you to run virtual machines with various operating systems including Windows, Linux, and FreeBSD on different hosts, while providing you with the ability to migrate VMs between hosts. In present day, VMware is one of the leading providers in virtualization technologies.
By Michael Bose How to Run Mac OS on VMware ESXi
