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  2. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.

  3. List of search engines - Wikipedia

    en.wikipedia.org/wiki/List_of_search_engines

    Download as PDF; Printable version; ... Search engines, including web search engines, ... Searches for files stored locally, and the cloud and inbox and, is summoned ...

  4. Search engine - Wikipedia

    en.wikipedia.org/wiki/Search_engine

    A search engine maintains the following processes in near real time: [34] Web crawling; Indexing; Searching [35] Web search engines get their information by web crawling from site to site. The "spider" checks for the standard filename robots.txt, addressed to it. The robots.txt file contains directives for search spiders, telling it which pages ...

  5. AOL

    search.aol.com

    The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web. AOL.

  6. List of academic databases and search engines - Wikipedia

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

    Databases and search engines differ substantially in terms of coverage and retrieval qualities. [1] Users need to account for qualities and limitations of databases and search engines, especially those searching systematically for records such as in systematic reviews or meta-analyses. [2]

  7. Comparison of search engines - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_search_engines

    The first table lists the company behind the engine, volume and ad support and identifies the nature of the software being used as free software or proprietary software. The second and third table lists internet privacy aspects along with other technical parameters, such as whether the engine provides personalization (alternatively viewed as a ...