IT is short for Information Technology and is pronounced as separate letters. Information technology is the broad subject concerned with all aspects of managing and processing information, especially within a large organization. IT is generally not used in reference to personal or home computing and networking.
I.T. is more than Computers and Networks:
While IT is often used to describe computers and computer networks, it actually includes all layers of all systems within an organization — from the physical hardware to the operating systems, application, databases, storage, server and more. Telecommunication technologies and including internet are also part of an organization's IT infrastructure.
Computer systems are central to information management, computer departments within companies and universities are often called IT departments.
Er. Pankaj Kumar