Difference between bare metal (hypervisor based) and host virtualization types

Question

What is the difference between bare-metal (hypervisor-based) and host virtualization types ?

Answer 1

A well-known example of a hosted hypervisor is Oracle VM VirtualBox. Others include VMWare Server and Workstation, Microsoft Virtual PC, KVM, QEMU and Parallels. rest is over here

Can I say openstack is relying on hosted virtualization as KVM,qemu is listed in this branch

Answer 2

bare metal- Metal(hardware)+minimum things required to run an OS. So in that sense, bare metal hypervisor is also hosted.

host virtualization - On the existing host along with your favourite music player, text editor, hypervisor is installed just like an app.