SEO: How Search Engines Work

Search engines trawl the web, sifting through billions of data points to serve up information in a fraction of a second. The access to instant information we’ve come to take for granted is based on an enormous system of data retrieval and software. Google has been the most forthcoming about how its search engine works, so I’ll use it as an example. At the simplest level, search engines do two things. Index information. Discover and store information about 30 trillion individual pages on the World Wide Web. Return results. Through a sophisticated series of algorithms and machine learning, identify and display to the searcher the pages most relevant to her search query. Crawling and Indexation How did Google find 30 million web pages? Over the past 18 years, Google has…

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