Usenet/newsgroups are Internet based electronic discussion groups. Usenet is composed of newsgroups which are categorized into several large 'trees', each of which is broken down into more and more specific topical sub-trees, sub-sub-trees, etc. The content of each newsgroup are postings that contain text composed by newsgroup users. Postings resemble email, but instead of being sent between people, they are available to anyone who has access to the Internet and Newsreader software.
CDC National AIDS Clearinghouse: Electronic Access to HIV/AIDS Information. HIV/AIDS Usenet/newspgrous Page. Last updated: 9/97