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

That's the hypervisor.

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.