A newsgroup is a medium which allows people to exchange ideas and information. A newsgroup is basically a forum for discussion.
Users post their ideas on a particular subject and other users respond over a period of time.
The network which allows this exchange of information between all newsgroups is called Usenet . Ideas on the same subject make up a thread. Messages which have been written by different people at different times can still be part of the same thread. By following a thread, one can read all responses to a particular subject. You need a browser in order to access a newsgroup.