USENET Newsgroups
Usenet Newsgroups are electronic forums for discussion, debate, questions, information, etc.
Newsgroups are distributed via network news feed to computer sites all over the world. Each computer site accumulates the articles and redistributes them to its own users.
Using newsreader software you can read posted articles, reply, post new articles, and save articles on your personal computer.
Newsgroups are organized into top level categories, which are collections of newsgroups.