Search engines like Google and Yahoo use automated programs called "spiders" to follow links from page to page (and site to site), looking for as many pages as they can find.
The search engine then downloads all of the material (the HTML file and graphics) from a web page for analysis; Google considers more than 100 parameters that describe websites and web pages.
Then, when you type in a keyword or keyword phrase into the search engine, it looks through the many downloaded pages to find the one that matches your request. Google uses a proprietary algorithm or method to determine the best pages in priority order. A high search engine ranking (in the top ten or twenty) is highly sought after, because most people will not look past the first or second page of results when looking for something.
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