A virtual machine is a software computer that, like a physical computer, runs an operating system and applications. The virtual machine consists of a set of specification and configuration files, and is backed by the physical resources of a host. Every virtual machine has virtual devices that provide the same functionality as physical hardware but are more portable, more secure, and easier to manage.

In addition to the operations that you can run on a physical machine, vCloud Director virtual machines support virtual infrastructure operations, such as taking a snapshot of virtual machine state, and moving a virtual machine from one host to another.

Starting with vCloud Director 9.5, virtual machines support IPv6 connectivity. You can assign IPv6 addresses to virtual machines connected to IPv6 networks.

Important: All steps for working with virtual machines are documented from the card view, assuming that you have more than one virtual data center. Completing the same procedures from the grid view is also possible, but the steps might slightly vary.

Source: https://docs.vmware.com/en/vCloud-Director/9.5/com.vmware.vcloud.tenantportal.doc/GUID-DF0C111D-B638-4EC3-B805-CC33994F8D53.html