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How do search engine spiders work?
Spiders, such as Googlebot, visit web pages in search of new data to add to the index. This is critical because Google’s business model (attract consumers and sell ad space) is reliant on providing high-quality, relevant, and up-to-date search results.
The spiders are pretty smart, too. They recognize hyperlinks, which they can either follow right away, or take a note of for later crawling. Either way, internal links between pages on the same site function similarly to stepping stones, in that they pave the way for spiders to crawl and store new information.