Migration (virtualization)

In the context of virtualization, where a guest simulation of an entire computer is actually merely a software virtual machine (VM) running on a host computer under a hypervisor, migration (also known as teleportation, also known as live migration) is the process by which a running virtual machine is moved from one physical host to another, with little or no disruption in service. == Subjective effects == Ideally, the process is completely transparent, resulting in no disruption of service (or downtime).

Source: Wikipedia — Migration (virtualization) (CC BY-SA 4.0)