Usenet is a world-wide distributed discussion system. It consists of a set of newsgroups with names that are classified hierarchically by subject. Articles or messages are posted to these newsgroups by people on computers with the appropriate software. These articles are then broadcast to other interconnected computer systems via a wide variety of networks. Some newsgroups are moderated where the articles are first sent to a moderator for approval before appearing in the newsgroup. Usenet is available on a wide variety of computer systems and networks, but the bulk of modern Usenet traffic is transported over the Internet.
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