Many Web hosting companies use virtual servers for their clients, as they can offer a viable and a cost-efficient service, through it. As Virtual Servers doesn’t use the entire resources on its host computer, they can be dedicated for individual client server applications. Since, the web hosting company hosts small virtual servers on a single physical server, the cost of web hosting can be achieved at lower costs. Moreover, there will be no change in the working and services offered by the websites, which are hosted on virtual servers. As they get the same effect of being hosted on dedicated servers.
The force driving server virtualization is similar to that which led to the development of time-sharing and multiprogramming in the past. Although the resources are still shared, as under the time-sharing model, virtualization provides a higher level of security, dependent on the type of virtualization used, as the individual virtual servers are mostly isolated from each other and may run their own full-fledged operating system which can be independently rebooted as a virtual instance.