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Computer, phone, TV networks to converged network.

What Is IT?  Networking

Since Information Technology (IT) is really communication-of-information technology, IT is mostly computer networking. (Cyber is a prefix meaning IT, so for example, IT security is also known as cybersecurity.) Computer includes supercomputers, desktops, laptops, tablets, phones, TV, etc. There has been a "convergence" and all of these devices now communicate -- their most important function -- over the same networks, particularly the Internet, where before, particularly for phone, TV and desktops, they had their own networks. Thus, being an IT expert means being a networking expert.

Networking, at its first, lowest, physical layer (hardware; e.g., cables, wireless), is mostly electrical engineering. At its last, highest, application layer (software; e.g., the World Wide Web), it is mostly computer science. However, at either end, extensive knowledge of the other end is necessary. See Credentials.

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