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  2. List of academic databases and search engines - Wikipedia

    en.wikipedia.org/wiki/List_of_academic_databases...

    A gateway to government science information and research results from over 60 databases, over 2,200 websites, and over 200 million pages. Free United States Government: Science Citation Index [67] Multidisciplinary: Part of Web of Science. 24,000+ journals across 254 subject disciplines. Subscription Clarivate Analytics: Scientific Information ...

  3. Wikipedia:List of free online resources - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:List_of_free...

    ipl2 - merger of the collections of resources from the Internet Public Library (IPL) and the Librarians' Internet Index (LII) websites, hosted by Drexel University College of Information Science and Technology; Refdesk - free and family-friendly web site that indexes and reviews quality, credible, and current web-based resources

  4. List of most-visited websites - Wikipedia

    en.wikipedia.org/wiki/List_of_most-visited_websites

    Website Domain name Ranking Type Company / Nonprofit organization Country Similarweb (November 2024) Semrush (November 2024) Google Search: google.com: 1 () 1 () Search Engine Google United States YouTube: youtube.com: 2 () 2 () Video-sharing platform Google United States Facebook: facebook.com: 3 () 3 () Social Media Networks Meta United ...

  5. Search engine indexing - Wikipedia

    en.wikipedia.org/wiki/Search_engine_indexing

    The forward index is the consumer of the information produced by the corpus, and the inverted index is the consumer of information produced by the forward index. This is commonly referred to as a producer-consumer model. The indexer is the producer of searchable information and users are the consumers that need to search.

  6. Search engine (computing) - Wikipedia

    en.wikipedia.org/wiki/Search_engine_(computing)

    Search engine experience for users continues to be enhanced. Google's addition of the Google Knowledge Graph has had wider ramifications for the Internet, possibly even limiting certain websites traffic, for example Wikipedia. By pulling information and presenting it on Google's page, some argue that it can negatively affect other sites.

  7. Google Search - Wikipedia

    en.wikipedia.org/wiki/Google_Search

    Google Real-Time Search was a feature of Google Search in which search results also sometimes included real-time information from sources such as Twitter, Facebook, blogs, and news websites. [183] The feature was introduced on December 7, 2009, [ 184 ] and went offline on July 2, 2011, after the deal with Twitter expired. [ 185 ]

  8. Information retrieval - Wikipedia

    en.wikipedia.org/wiki/Information_retrieval

    Information retrieval is the science [1] of searching for information in a document, searching for documents themselves, and also searching for the metadata that describes data, and for databases of texts, images or sounds. Automated information retrieval systems are used to reduce what has been called information overload. An IR system is a ...

  9. Web crawler - Wikipedia

    en.wikipedia.org/wiki/Web_crawler

    Web crawlers copy pages for processing by a search engine, which indexes the downloaded pages so that users can search more efficiently. Crawlers consume resources on visited systems and often visit sites unprompted. Issues of schedule, load, and "politeness" come into play when large collections of pages are accessed.