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As the spider gathers Universal Resource Locator (URL) and document data, the search engine's software sends this web page data to its indexing software, which stores the information in a database. The manner in which the data is extracted, indexed, and stored varies from search engine to search engine. Some search engines index every word in a document; others index only the most relevant words and phrases. Most search engines index each document's size and word count as well as its title and heading tags.
When a user visits a search engine and types in a certain word or phrase, relevant web page titles, descriptions (or extracts), and URLs will appear after the database index is searched. When the user clicks on the link to a web page, he or she is taken directly to that web page. Thanks to search engines, web surfers can find the information they are looking for quickly and accurately!
To try out the Google custom search engine on this website, visit our Custom Search page.
To learn more about search engines and their history, visit Wikipedia's Web search engine page.
For an extensive, annotated list of all-purpose and specialized search engines, visit The Search Engine List.
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