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Webmasters, SEOs talk about Google and not other search engines like Bing and the words 'crawl', 'spider' and index are interchangeable words that they often use. Nowadays there are several spider simulator tools available on the internet. Most of them try to simulate the spider that is used by Google.
Every SEO wants to know how Google does its website ranking. No one outside Google knows the algorithm, and that is composed of thousands of code and mathematical calculations. The spider simulator tool found on the web tries to emulate Google.