Crawlers and Indexers have become the more successful form of Internet searching available today. Crawlers and Indexers deploy bots, or spiders, which scour the web looking for new websites and content which they then index and categorize through some form of ranking algorithm in order to deliver search results to end users. Advantages of Crawlers and Indexers include greater reach and the ability to deliver relevant content for uncommon or rare search terms, a benefit which is almost impossible to attain with a web directory.

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