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ITITIT**Virtualization in an IT environment is essentially the isolation of one computing resource from the others. By separating the different layers in the logic stack, you enable greater flexibility and simplified change managementyou no longer need to configure each element for them to all work together.In a traditional hardware/software stack, all of the elements are bound together, required specific configuration to allow the components to properly interact with each other. Creating new capability entails procuring and configuring the hardware, software and interfaces.

In a virtualized stack. Each element is logically isolated and independent. Adding new capability can be as simple as replicating an OS and application instance on existing hardware that has excess capacity.Perhaps the best way to understand Virtualization in a practical application is to look at the most common use, machine virtualization. Machine Virtualization is where an Operating System and Application are packaged together to form a virtual machine, which is then hosted on a physical server running a host operating system or Hypervisor (a thin layer of software that provides the basic interface with the hardware).

The most important concept to understand is that this virtual machine (OS+App) is operating independent from the OS on the physical server. In fact, multiple virtual machines can run on a single physical server, while providing the isolation and security as if they were each on their own discrete hardware.

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