A web crawler tool emulates search engine bots. Web crawlers are indispensable for search engine optimization. But leading crawlers are so comprehensive that their findings — lists of URLs and the various statuses and metrics of each — can be overwhelming. For example, a crawler can show (for each page): Number of internal links, Number of outbound links, HTTP status code, A noindex meta tag or robots.txt directive, Amount of non-linked text, Number of organic search clicks… Source link
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