Virtualization refers to the representation of physical computing resources in simulated form having been made through the software. This special layer of software (installed overactive physical machines) is referred to as a layer of virtualization. This layer transforms the physical computing resources into a virtual form which users use to satisfy their computing needs. Figure 7.1represents the basic concept of virtualization in simplified form which has been elaborated in the subsequent sections


         FIG 7.1:Users’ interaction with computers in traditional and virtualized environments

In a simple sense, virtualization is the logical separation of physical resources from direct access of users to fulfill their service needs. However, in the end the physical resources are responsible for providing those services. The idea of virtualizing a computer system’s resources(including processor, memory, storage, etc.) has been well-established for many decades. Virtualization provides a level of logical abstraction that liberates user-installed software(starting from operating systems and other systems as well as application software) from being tied to a specific set of hardware. Rather, the users install everything over the logical operating environment (rather than physical ones) created through virtualization. 

Virtualization decouples the physical computing resources from direct access of users

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