Virtual desktop infrastructure (VDI) is a virtualization technique enabling access to a virtualized desktop, which is hosted on a remote service over the Internet. It refers to the software, hardware and other resources required for the virtualization of a standard desktop system.
Just like server virtualization, desktop virtualization relies on a thin layer of software known as a hypervisor, which runs on bare-metal server hardware and provides a platform on which administrators deploy and manage virtual machines. With desktop virtualization, each user gets a virtual machine that contains a separate instance of the desktop operating system (almost always Windows) and whatever applications have been installed. To the desktop OS, the applications, and the user, the VM does a pretty good job of impersonating a real desktop machine.
VDI is a shadow copy of the desktop including its OS, installed applications and documents, which are stored and executed entirely from the server hosting it. VDI provides users the ability to access their desktop remotely, often even from a handheld device because the entire process of executing the interface is done at the central server.This type of desktop virtualization uses the server computing model, as the desktop virtualization in this scenario is enabled through hardware and software. VDI hosts the desktop environment in a virtual machine (VM) that runs on a centralized or remote server.