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.
Server virtualization is the masking of server resources, including the number and identity of individual physical servers, processors, and operating systems, from server users. The server administrator uses a software application to divide one physical server into multiple isolated virtual environments. The virtual environments are sometimes called virtual private servers, but they are also known as guests, instances, containers or emulations.
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