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[typewriter keys clack]

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[Matt Cutts][br]Hi, my name is Matt Cutts.

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I'm an engineer in the quality [br]group at Google

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and I'd like to talk today[br]about what happens

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when you do a web search.

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The first thing to understand is[br]that when you do a Google search,

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you aren't actually searching the web, [br]you're searching Google's index of the web

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or at least as much of it as we can find.

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We do this with software programs[br]called spiders.

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Spiders start by fetching a few web pages[br]then they follow the links on those pages

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and fetch the pages they point to[br]and follow all the links on those pages

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and fetch the pages they link to [br]and so on

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until we've indexed a pretty big chunk[br]of the web,

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many billions of pages stored[br]across thousands of machines.

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Now, suppose I want to know[br]how fast a cheetah can run.

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I type in my search, say, [br]cheetah running speed and hit return.

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Our software searches our index[br]to find every page

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that includes those search terms.

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In this case, there are [br]hundreds of thousands of possible results.

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How does Google decide [br]which few documents I really want?

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By asking questions, [br]more than 200 of them.

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Like, how many times does this page[br]contain your keywords?

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Do the words appear in the title,[br]in the URL, directly adjacent?

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Does the page include synonyms[br]for those words?

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Is this page from a quality website [br]or is it low quality, even spamming?

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What is this page's PageRank?

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That's a formula invented by our founders,[br]Larry Page and Sergey Brin,

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that rates a web page's importance

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by looking at how many outside links point[br]to it, and how important those links are.

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Finally, we combine all[br]those factors together

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to produce each page's overall score [br]and send you back your search results,

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about half a second[br]after you submit your search.

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At Google, we take our commitment[br]to delivering useful

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and impartial search results[br]very seriously.

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We don't ever accept payment[br]to add a site to our index,

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update it more often,[br]or improve its ranking.

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Let's take a look at my search results.

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Each entry includes a title,[br]a URL, and a snippet of text

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to help me decide whether this page is[br]what I'm looking for.

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I also see links to similar pages,

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Google's most recent[br]stored version of that page,

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and related searches [br]that I might want to try next.

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And sometimes, along the right [br]and at the top I'll see ads.

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We take our advertising business[br]very seriously as well,

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both our commitment to deliver the best[br]possible audience for advertisers

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and to strive to only show ads [br]that you really want to see.

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We're very careful to distinguish your ads[br]from regular search results

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and we won't show you any ads at all

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if we can't find any that we think[br]will help you find the information

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you're looking for [br]which, in this case,

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the cheetah's top running speed,[br]is more than 60 miles an hour.

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Thanks for watching,

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I hope this made Google[br]a little bit more understandable.