Definition

Technology that allows you to create multiple simulated environments or dedicated resources from single, physical hardware system.

Hypervisor connects directly to that hardware and allows splitting 1 system into separate, distinct, and secure environments known as VMs.

Uses

Network functions isolated, virtual networks can be created from 1 original network.

Server single server can be made to act like multiple.

OS 1 computer can run multiple different OSs.

Benefits

Virtualizing resources lets administrators pool their physical resources, so their hardware can truly be commoditized.

Legacy infrastructure that's expensive to maintain, but supports important apps, can be virtualized for optimal use. No longer necessary to wait for every app to be certified on new hardware.

During regression tests, testbed can be created or copied easily.