Crawling, Indexing, and Ranking :
Understanding how crawling, indexing, and ranking works is helpful to SEO practitioners, as it helps them determine what actions to take to meet their goals. Google and Bing operate, and does not necessarily apply to other search engines that are popular in other countries, such as Yandex (Russia), Baidu (China), Seznam (Czechoslovakia), and Naver (Korea).
The search engines must execute many things very well to provide relevant search results. Put simplistically, you can think of these as:
• Crawling and indexing trillions of documents (pages and files) on the Web (note that they ignore pages that they consider to be “insignificant”, perhaps because they are perceived as adding no new value or are not referenced at all on the web).
• Responding to user queries by providing lists of relevant pages
In this section, we’ll walk through the basics of these functions from a nontechnical.
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