A Usenet newsgroup is a repository usually within the Usenet system, for messages Posting style from users in different locations using the Internet. They are and are not devoted to publishing news. Newsgroups are technically distinct from, but functionally similar to, Internet forum on the World Wide Web. News client software is used to read the content of newsgroups.
Before the adoption of the World Wide Web, Usenet newsgroups were among the most popular Internet services, and have retained their noncommercial nature in contrast to the increasingly ad-laden web. In recent years, this form of open discussion on the Internet has lost considerable ground to individually-operated browser-accessible forums and Mass media social networks such as Facebook and Twitter.
Communication is facilitated by the Network News Transfer Protocol (NNTP) which allows connection to Usenet servers and data transfer over the internet. Similar to another early (yet still used) protocol SMTP which is used for email messages, NNTP allows both server-server and client-server communication. This means that newsgroups can be replicated from server to server which gives the Usenet network the ability to maintain a level of robust data persistence as a result of built-in data redundancy. However, most users will access using only the client-server commands of NNTP and in almost all cases will use a GUI for browsing as opposed to command line based client-server communication specified in the NNTP protocol.
Back when the early community was the pioneering computer society, the common habit seen with many posts was a notice at the end that disclosed whether the author had (or was free of) a personal interest (financial, political or otherwise) in making the post. This is rarer now, and the posts must be read more skeptically, as with other media. Privacy and phishing issues have also risen in importance.
The number of newsgroups grew from more than 100 as of 1983 to more than 110,000, but only 20,000 or so of those are active. Newsgroups vary in popularity; some newsgroups receive fewer than a dozen posts per year while the most popular can get several thousand in under an hour.
There were originally a number of obstacles to the transfer of binary files over Usenet. Usenet was originally designed with the transmission of text in mind, and so the encoding of posts caused losses in binary data where the data was not part of the protocol's character set. Consequently, for a long while, it was impossible to send binary data as such. As workarounds, such as Uuencode and later Base64 and yEnc were developed which encoded the binary data from the files to be transmitted (e.g. sound or video files) to text characters which would survive transmission over Usenet. At the receiver's end, the data needed to be decoded by the user's news client.
Additionally, there was a limit on the size of individual posts so that large files could not be sent as single posts. To get around this, Newsreaders were developed which were able to split long files into several posts. Intelligent newsreaders at the other end could then automatically group such split files into single files, allowing the user to easily retrieve the file. These advances have meant that Usenet is used to send and receive many terabytes of files per day.
There are two main issues that pose problems for transmitting large files over newsgroups. The first is and the other is . The business of premium is generated primarily on their ability to offer superior completion and retention rates, as well as their ability to offer very fast connections to users. Completion rates are significant when users wish to download large files that are split into pieces; if any one piece is missing, it is impossible to successfully download and reassemble the desired file. To work around the problem, a redundancy scheme known as Parchive (PAR) is commonly used.
Major News server have a retention time of more than 7 years. A number of websites exist to keep an index of files posted to binary newsgroups.
Partly because of such long retention times, as well as growing and speeds, Usenet is also used by individuals to store backup data in a practice called Usenet backup, or uBackup. While commercial providers offer easier-to-use online backup services, storing data on Usenet is free of charge (although access to Usenet itself may not be). A user must manually select, prepare and upload the data. Because anyone can download the backup files, the data is typically encryption. After the files are uploaded, the uploader has no control over them; they are automatically distributed to all Usenet providers that subscribe to the newsgroup they are uploaded to, so there will be copies of them spread all around the world.
Newsgroup servers are hosted by various organizations and institutions. Most Internet service providers host their own , or rent access to one, for their subscribers. There are also a number of companies who sell access to premium news servers.
Every host of a news server maintains agreements with other nearby news servers to synchronize regularly. In this way news servers form a redundant network. When a user posts to one news server, the post is stored locally. That server then shares posts with the servers that are connected to it for those newsgroups they both carry. Those servers do likewise, propagating the posts through the network. For newsgroups that are not widely carried, sometimes a carrier group is used for crossposting to aid distribution. This is typically only useful for groups that have been removed or newer alt.* groups. Crossposts between hierarchies, outside of the Big 8 and alt.* hierarchies, are prone to failure.
The most commonly known hierarchies are the Usenet hierarchies. So for instance newsgroup rec.arts.sf.starwars.games would be in the rec.* top-level Usenet hierarchy, where the asterisk (*) is defined as a wildcard character. There were seven original major hierarchies of Usenet newsgroups, known as the "Big 7":
These were all created in the Great Renaming of 1986–1987, before which all of these newsgroups were in the net.* hierarchy. At that time there was a great controversy over what newsgroups should be allowed. Among those that the Backbone cabal (who effectively ran the Big 7 at the time) did not allow were those concerning , recreational drug use, and sex.
This situation resulted in the creation of an alt.* (short for "alternative") Usenet hierarchy, under which these groups would be allowed. Over time, the laxness of rules on newsgroup creation in alt.* compared to the Big 7 meant that many new topics could, given time, gain enough popularity to get a Big 7 newsgroup. There was a rapid growth of alt.* as a result, and the trend continues to this day. Because of the anarchistic nature with which the groups sprang up, some jokingly referred to ALT standing for "anarchist, lunatic and terrorist" (a backronym).
In 1995, humanities.* was created for the discussion of the humanities (e.g. literature, philosophy), and the Big 7 became the Big 8.
The alt.* hierarchy has discussion of all kinds of topics, and many hierarchies for discussion specific to a particular geographical area or in a language other than English.
Before a new Big 8 newsgroup can be created, an RFD (Request For Discussion) must be posted into the newsgroup news:news.announce.newgroups, which is then discussed in news:news.groups.proposals. Once the proposal has been formalized with a name, description, charter, the Big-8 Management Board will vote on whether to create the group. If the proposal is approved by the Big-8 Management Board, the group is created. Groups are removed in a similar manner.
Creating a new group in the alt.* hierarchy is not subject to the same rules; anybody can create a newsgroup, and anybody can remove it, but most news administrators will ignore these requests unless a local user requests the group by name.
Additionally, there is the free.* hierarchy, which can be considered "more alt than alt.*". There are many local sub-hierarchies within this hierarchy, usually for specific countries or cultures (such as free.it.* for Italy).