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Search engine indexing is the collecting, parsing, and storing of data to facilitate fast and accurate information retrieval.Index design incorporates interdisciplinary concepts from linguistics, cognitive psychology, mathematics, informatics, and computer science.
There are a variety of ways in which Wikipedia attempts to control search engine indexing, commonly termed "noindexing" on Wikipedia. The default behavior is that articles older than 90 days are indexed. All of the methods rely on using the noindex HTML meta tag, which tells search engines not to index certain pages. Respecting the tag ...
Wikipedia's powerful presence as the internet's eighth most-popular website gives all our pages very heavy weighting in search engine rankings; a Wikipedia page that matches the search term entered is almost guaranteed a place in the top ten results, regardless of the actual page content. While this is an extremely positive status for our ...
Most search engines employ methods to rank the results to provide the "best" results first. How a search engine decides which pages are the best matches, and what order the results should be shown in, varies widely from one engine to another. [35] The methods also change over time as Internet usage changes and new techniques evolve.
Search engines, including web search engines, selection-based search engines, ... (anno 2018) limited to indexing a maximum of 10.000 files. Proprietary (30 day trial
Web indexing, or Internet indexing, comprises methods for indexing the contents of a website or of the Internet as a whole. Individual websites or intranets may use a back-of-the-book index , while search engines usually use keywords and metadata to provide a more useful vocabulary for Internet or onsite searching.
The noindex meta tab is merely a request to web crawlers - Google generally honors these - but some search engine may not. Finally, being available for indexed doesn't require or "push" a notice to all of the search providers of the world - it is up to them to fetch and index a page - sometimes this is fast, sometimes it takes a long time.
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]