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Indexing - the process used by the search engines to crawl the web, scanning webpages and storing information about them.

The indexing of web content is a complex and time-consuming process. It uses different methods from various scientific fields such as computer science and information science. Leading search engines such as Google, Yahoo, and Bing rely on crawlers to index web content. These are autonomous software programs that work in a similar way as robots, which is why they are often called search engine bots or robots. Crawlers navigate through the internet and continuously add web content to the search engines' index. The content is sorted and divided into hierarchical levels using an algorithm. This hierarchy is the main factor that determines the order in which search results are displayed when users enter a search query.