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A web crawler is a bot (AKA crawling agent, spider bot, web crawling software, website spider, or a search engine bot) that goes through websites and collects information. Google uses crawlers primarily to find and index web pages. Crawling can be used to power your business, gain a competitive advantage, or steer away from fraud. The most popular business use cases that use web crawlers are to use proxies as a way to avoid blocking and detection by implementing a pool of proxies.