Answer: Virtualization
Explanation: Virtualization is the term that describes about creation of something than its actual version. In computer field , virtualization can happen in the storage devices, server elements,network components , operating systems etc.
The mechanism of virtualization helps in a creating a framework in which the resources is divided into multiple units so that more execution and processing can be done in operating system environment. So, the data center has used the virtualization trend for the separate web servers