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How Search Works

From Google:

How Google Search works from algorithms to answers.

Google navigates the web by crawling.

That means we follow links from page to page. Site owners choose whether their sites are crawled. We sort the pages by their content and other factors. The index includes text from millions of books from several libraries and other partners.

"The perfect search engine would understand exactly what you mean and give you back exactly what you want." Larry Page Co-founder & CEO

Thanks to Street View, we can also include information from the physical world. The Knowledge Graph provides better answers by organizing information about real world people, places and things.

It's over 100 million gigabytes.

And we keep track of it all in THE INDEX.

Read the rest at Google.