A Bulletin Board System (BBS) is an additional service of a mailbox and corresponds functionally to a bulletin board, which can be used by the users for the exchange of opinions and experiences, but also for downloadingfiles.
A BBS system is formed from the totality of the thematically structured information, its administration by means of a news server and the access authorization via a news reader. Access can be public, but is usually restricted to defined user groups.
Typical bulletin board systems are, for example, information services of universities. The best known BBS is the newsgroup in Usenet.