The actual need for virtualization basically requires the prior understanding of three things: Why Virtualize? What is Virtualization? And When to Virtualize?
The virtualization technology evolution dates back to the times of main frame computers, where the operators had to utilise huge power resource to run processes. Operating Virtualization addressed this issue by allowing the hardware resource to run multiple operation system images using a single software tool, thus managing the power utilisation in running processes.
Server virtualization is the key aspect of virtualization technology, where the main server is virtualised to create a guest system that exactly works as a main system. A software layer called hypervisor makes this happen by emulating underlying hardware. Here the guest operating system uses the software emulation of the underlying hardware, i.e., virtualized hardware and not the true hardware.
The performance of the virtual system is not exactly the same as that of the true system. Even then the virtualization holds significance as the most applications and guest systems may not demand for full utilization of the underlying hardware.
Thus, the dependence on hardware is alleviated, allowing