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Joomla! Search Engine Optimization by Ric Shreves

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How search engines assess sites

Search engines all function in approximately the same fashion: A software agent, known as a bot, a spider, or a crawler, visits a page, gathers the content, and stores it in the search engine's data repository. Once the information is in the repository, it is indexed. The crawling and indexing processes are constant and on-going. Each of the major search engines maintains multiple crawlers that work tirelessly to refresh its index. The spiders find new pages by a variety of methods, typically including XML Site Maps, URLs already in the index, links to pages discovered while indexing, and URLs submitted for inclusion by users. How frequently they visit a specific site, and how deeply they spider the site each visit, ...

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