Once they were deployed and into production, the organizations found most of the resources are not fully utilized, meaning that cost efficiency was not achieved.
Therefore the idea of sharing resources amongst several virtual machines was introduced. This process is referred to as “Server Virtualization” which changes the properties of a physical server and makes it perform as a logical resource that can be shared by several virtual machines.
There are a lot of big players in the virtualization market; among them are VMware, Microsoft and Citrix.