A nested VM (nested virtual machine) is a virtual machine contained within another VM.
Nested VMs are used for testing out hypervisors and new operating systems in lab environments. Administrators using one hypervisor can nest a competitive hypervisor to try its features. Nested hypervisors also can support cloud deployments, nesting the specific hypervisor required for VM images on the user's hypervisor.
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The nested VM does not interface directly with the underlying physical hardware. Older VMware hypervisor architectures, such as Workstation 7, do not support nested VMs that require hardware-assisted virtualization. Nested virtual machines on VMware hypervisors also have networking, official support and VMware vMotion limitations to consider.