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Web crawling is done by Google's search bots, or "spiders," which are automated pieces of software. Sounds spooky, we agree. Yet all it implies is that they access websites. Second, they add such pages to Google's index and catalog them so that they are properly optimized and crawlable. Finally, out of the billions of pages in Google's database, when someone searches, Google displays what it deems to be the most pertinent results depending on the search parameters they submit.
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