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Telecommunications is an essential part of the lives of most people.
A telecommunications network is a collection of nodes and links that is capable of carrying audio, visual, and data communications. While the term was once used to refer only to the collection of switches and wiring used by telephone service providers to provide audio connectivity to residential and business customers, it is now understood to include Internet, microwave, and wireless equipment as well as the more traditional forms of telephony. There are several different classes of telecommunication networks, with each of them having a slightly different focus.