How Google Search Works? (including original research paper on google search)

Google Search is an extremely powerful tool, so much so that today, “Google” has become synonymous with “Search”. It is hard to imagine how one would be able to find any information on the world wide web without a search engine like Google. Google search is like giving you a book, open on the page with the topic that you want to read.

Like all search engines, Google also uses a special algorithm to generate search results.

While Google shares general facts about its algorithm, the specifics are a company secret. This helps Google remain competitive with other search engines on the Web and reduces the chance of someone finding out how to abuse the system.

Google uses automated programs called spiders or crawlers, just like most search engines. Also like other search engines, Google has a large index of keywords and where those words can be found. What sets Google apart is how it ranks search results, which in turn determines the order Google displays results on its search engine results page (SERP). Google uses a trademarked algorithm called PageRank, which assigns each Web page a relevancy score.

These spiders or crawlers traverse the web to collect page attributes like titles, authors, databases, links etc. They then map this data to create a structured index, which is then curated and ranked using their page-rank algorithm enabling Google to instantly provide us with the information we need.

Now the important part. After generating this structure Google uses an algorithm call page-rank algorithm to rank the pages based on its importance. Now “how is the importance decided?” simple. The page that is referred by many other pages is important, like B which is referred by almost all pages. Also the pages referred by B like page E become important because they are referred by a important page despite not being referred by other pages. Likewise pages that are not referred have a very low rank.

 

Deep Dive into How Google Search Works:

  • Research paper on Google search by Sergey Brin and Eric Schimdt:

Research paper on Google search

  • Google Inside Search Page: How Search Works:

http://www.google.co.in/insidesearch/howsearchworks/thestory/

  • History of Google Search Algorithms:

http://moz.com/google-algorithm-change

 

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