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How Search Engines Operate?

Search engines have a short list of critical operations that allows them to provide relevant web results when searchers use their system to find information.

  1. Crawling the Web:
  1. Search engines run automated programs, called "bots" or "spiders” that use the hyperlink structure of the web to "crawl" the pages and documents.
  2. Estimates are that of the approximately 20 billion existing pages, search engines have crawled between 8 and 10 billion.
  3. When a  user requested  for information comes into the search engine the engine retrieves from its index all the documents that match the query.
  4. For example, a search for sports cars at Google returns approx. 6.25 million results, but a search for the same phrase in quotes ("sports cars") returns only approx 245 thousand results. For more info other advanced operators go to http://www.google.com/support/websearch/bin/answer.py?hl=en&answer=136861
  5. Once the search engine has determined which results are a match for the query, the engine's algorithm runs calculations on each of the results to determine which is most relevant to the given query.
  6. They sort these on the results pages in order from most relevant to least so that users can make a choice about which to select.
  1. Indexing Documents:
    1. Once a page has been crawled, its contents can be "indexed" - stored in a database of documents that makes up a search engine's "index" and sort billions of documents can be completed in fractions of a second.
  2. Processing Queries:
  1. Ranking Results:

Major Search engines like Google, Yahoo! and MSN are among the most complex, processing computers in the world.

SEOestablish.com can improve your search engine rankings with our <a onClick="javascript:pageTracker._trackPageview('/outgoing/article_exit_link');" href="http://seoestablish.com/seoestablish-seo-services.html">Organic SEO services</a>, a leading SEO Service Company.
Chakri

The author is a SEO expert in Search Engine Optimization (SEO) and is capable of making your website appear top in search engines. Read more about Organic SEO services.

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