(1) (
Virtual 
Desktop 
Infrastructure)  Coined by VMware for its VMware server and Virtual Desktop Manager (VDM), the VDI term is also used generically for desktop virtualization.  Each desktop computer (VDI client) is running as a virtual machine (VM) in a server.  See 
desktop virtualization and 
thin client.
(2) (
Video 
Device 
Interface)  An Intel standard for speeding up full-motion video performance.  See 
DCI.
(3) (
Virtual 
Device 
Interface)  An ANSI standard format for creating device drivers.  VDI was incorporated into CGI.