The Deja News Research Service was an archive of messages posted to Usenet discussion groups, started in 1995 by Steve Madere in Austin, Texas. An archive refers to a collection of historical records and also refers to the location in which these records are kept Usenet, a Portmanteau of "user" and "network" is a world-wide distributed Internet discussion system Its powerful search engine capabilities won the service acclaim, generated controversy, and significantly changed the perceived nature of online discussion.
While archives of Usenet discussions had been kept for as long as the medium existed, Deja News offered a novel combination of features. It was available to the general public, provided a simple World Wide Web user interface, allowed searches across all archived newsgroups, returned immediate results, and retained messages indefinitely. The World Wide Web (commonly shortened to the Web) is a system of interlinked Hypertext documents accessed via the Internet. A newsgroup is a Repository usually within the Usenet system for messages posted from many users in different locations The search facilities transformed Usenet from a loosely organized and ephemeral communication tool into a valued information repository. The archive's relative permanence, combined with the ability to search messages by author, raised concerns about privacy and confirmed oft-repeated past admonishments that posters should be cautious in discussing themselves and others. Privacy is the ability of an individual or group to seclude themselves or information about themselves and thereby reveal themselves selectively 
While Madere was initially reluctant to remove archived material, protests from users and legal pressure led to the introduction of "nuking," a method for posters to permanently remove their own messages from search results. It already supported the use of an "X-No-Archive" message header, which if present would cause an article to be omitted from the archive. X-No-Archive, also known colloquially as xna, is a Newsgroup message header field used to prevent a Usenet message from being archived in various servers This did not prevent others from quoting the material in a later message and causing it to be stored. Copyright holders were also allowed to have material removed from the archive. Copyright is a legal concept enacted by Governments, giving the creator of an original work of authorship Exclusive rights to control its distribution usually for According to Humphrey Marr of Deja News, copyright actions most frequently came from the Church of Scientology. Scientology has been involved in a number of disputes on the Internet related to suppressing material critical of Scientology through the use of lawsuits 
The service was eventually expanded beyond search. My Deja News offered the ability to read Usenet in the traditional chronological, per-group manner, and to post new messages to the network. Deja Communities were private Internet forums offered primarily to businesses. An, or message board, is a Bulletin board system in the form of a discussion site In 1999 the site (now known as Deja. com) sharply changed direction and made its primary feature a shopping comparison service. During this transition, which involved relocation of the servers, many older messages in the Usenet archive became unavailable.
By late 2000 the company, in financial distress, sold the shopping service to eBay, who incorporated the technology into their half.com service. eBay Inc is an American Internet company that manages eBaycom an Online auction and shopping Website in which people and businesses buy and Halfcom is a subsidiary of EBay, in which sellers offer items at fixed prices usually items that have a UPC, ISBN or other kind of SKU
By 2001 the search service was shut down. The archives were acquired by Google and reintroduced as Google Groups. Google Inc is an American public corporation, earning revenue from advertising related to its Internet search, e-mail, online Google Groups is a free service from Google where groups of people have discussions about common interests Archive coverage was extended back to 1981 with the addition of collections from private sources. Longtime users sometimes refer to the resurrected archive as "Dejagoogle" or "Gooja" due to the dissatisfaction many felt with Google's revision.