What is crawling in SEO?

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When you hear people talk about Crawlers in the context of SEO, they are referring to the programs that search engines use to scan and analyze websites in order to determine their importance, and thus their ranking in the results of internet searches for certain keywords.

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Crawling means indexing of fresh content or new websites in the Search Engine results. If the crawling is slow, then you can make it fast by adding a sitemap in the web master tools.