Virtualization

memory systems, data centers, jvm, virtual box, ibm vm, google glass, cloud computing, dalvik(android), vmware work station, inception, and so on.

Platform virtualization
Alize Inc.
app, app, app
->
windows, linux, windows
Shared Hardware

Hypervisors
Native(bare metal)
guest os, guest os, guest os
Hypervisor
Shared Hardware