How does a crawler work?

 In principle, a crawler is like a librarian. It looks for information on the Web, which it assigns to certain categories, and then indexes and catalogues it so that the crawled information is retrievable and can be evaluated.

The operations of these computer programs need to be established before a crawl is initiated. Every order is thus defined in advance. The crawler then executes these instructions automatically. An index is created with the results of the crawler, which can be accessed through output software.

The information a crawler will gather from the Web depends on the particular instructions.

Examples of a crawler

The most well known crawler is the Googlebot, and there are many additional examples as search engines generally use their own web crawlers. For example

  • Bingbot
  • Slurp Bot
  • DuckDuckBot
  • Baiduspider
  • Yandex Bot
  • Sogou Spider
  • Exabot
  • Alexa Crawler[1]

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