Internet forum for discussion of specific subjects. Newsgroups are organized into subjects (e.g., automobiles); each typically has several subgroups (e.g., classic cars, Formula One racing cars). A person starts a threaded discussion by posting (uploading) an article; the follow-up replies (including replies to replies) comprise the discussion. A newsgroup name usually consists of an abbreviation (e.g., rec for the recreation newsgroup) followed by subgroup names separated by dots (e.g., rec.music.jazz). Viewing and posting messages requires a news reader, a program that connects the user to an Internet news server. Most newsgroups are connected via Usenet, a worldwide network that uses the Network News Transfer Protocol (NNTP). See alsobulletin-board system.