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What is Crawling?


rscomponentseo

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Crawling is the process performed by search engine crawler, when searching for relevant websites on the index. For instance,Google is constantly sending out "spiders" or "bots" which is a search engine's automatic navigator to discover which websites contain the most relevant information related to certain keywords.

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Crawling or web crawling refers to an automated process through which search engines filtrate web pages for proper indexing.

Web crawlers go through web pages, look for relevant keywords, hyperlinks and content, and bring information back to the web servers for indexing.

As crawlers like Google Bots also go through other linked pages on websites, companies build sitemaps for better accessibility and navigation.

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  • 3 weeks later...

Search robot (aka crawler, crawler, spider, bot) - a program for collecting content on the Internet. Seo crawler consists of many computers that request and select pages much faster than a user using their web browser. In fact, it can request thousands of different pages at the same time.

What else does the crawler robot:

Constantly checks and compares the list of URLs to crawl with URLs that are already in the Google index.
Removes duplicates in the queue to prevent the same page from being re-downloaded.
Adds modified pages for reindexing to provide updated results.

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In the context of SEO, ‘crawling’ basically refers to a robot which is automatically surfing the web, categorizing and analyzing each site it encounters.

There are two main types of such programs in SEO. The first one is the crawlers used by the main search engines, such as Google, Bing or Yandex. The second type is private commercial crawlers, used, for example, by SEO toolsets to establish and maintain fresh index of links and backlinks on the internet.

Crawling may sound pretty easy, by in practice if you want to achieve a useful speed and maintain a current database of links, you’ll need a ton of equipment. At Ahrefs, we’re running a custom big data database with close to 85 trillion rows. That’s what allows us to crawl ~200 million pages per hour, 7+ billion pages per day.

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