the.com/hypervisor
the landlord that rents out one computer's guts to a hundred pretend computers.
means software that creates and manages virtual machines by sharing one physical computer's hardware among them.
from coined in the 1960s IBM mainframe era, playing off supervisor (the OS kernel) — a program that supervises supervisors, hence hyper.
type 1runs directly on hardware, no host os needed
type 2runs atop a regular os, like a guest
cloud backboneaws and azure run on hypervisors at scale
escape bugssecurity holes letting vms break into the host