A newsreader is an application program that reads articles on Usenet distributed throughout newsgroups.[1] Newsreaders act as clients which connect to a news server, via the Network News Transfer Protocol (NNTP), to download articles and post new articles.[2] In addition to text-based articles, Usenet is also used to distribute binary files, generally in dedicated "binaries" newsgroups.
The term newsreader is sometimes (erroneously) used interchangeably with news aggregator.[citation needed]
Newsreaders that help users to adhere to the established conventions of Usenet, known as netiquette, are evaluated by the Good Netkeeping Seal of Approval (GNKSA).