When virtualization is used and bare-metal solutions are implemented, what is the item that resides between the virtual machines and the physical hardware called?

Compressor

HAL

Hypervisor

Archiver

The answer is Hypervisor

Explanation:

A hypervisor is computer software, application, a firmware or a hardware that creates and runs virtual machines. They are also called virtual machine monitor (VMM). A computer on which a hypervisor runs one or more virtual machines is called a host machine, while all the individual virtual machine is called a guest machine.

That's the hypervisor.