Virtualization is the creation of a virtual (rather than physical) version of something, such as an operating system, a server, a storage device or network resources. There are five areas of IT where virtualization is significant : Application Virtualization, Desktop Virtualization, Server Virtualization, Storage Virtualization and Network Virtualization. Virtualization can be viewed as part of an overall trend in enterprise IT that includes Autonomic Computing, a scenario in which the IT environment will be able to manage itself based on perceived activity, and Utility Computing, in which computer processing power is seen as a utility that clients can pay for only as needed. The usual goal of virtualization is to centralize administrative tasks while improving scalability and work loads.
Desktop virtualization involves encapsulating and delivering either access to an entire information system environment or the environment itself to a remote client device. The client device may use an entirely different hardware architecture than that used by the projected desktop environment, and may also be based upon an entirely different operating system.
The desktop virtualization model allows the use of virtual machines to let multiple network subscribers maintain individualized desktops on a single, centrally located computer or server. The central machine may operate at a residence, business, or data center. Users may be geographically scattered, but all may be connected to the central machine by a local area network, a wide area network, or the public Internet.
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