All of the hardware, software, networks, facilities, etc., that are required to develop, test, deliver, monitor, control or support IT services. The term IT infrastructure includes all of the Information Technology but not the associated People, Processes and documentation.
A mainframe is the central data repository, or hub, in a corporation's data processing center, linked to users through less powerful devices such as workstations or terminals. The presence of a mainframe often implies a centralized form of computing, as opposed to a distributed form of computing.
And the well-planned IT infrastructure solution can significantly reduce the costs and boost revenues. With the rapid growth of the organization, IT infrastructure grows even more rapidly from few servers initially to large data centers housing the modern technology. Thanks to virtualization, now you can have multiple virtual servers on a single real server.