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[typewriter keys clack]

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

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I'm an engineer in the quality 
group at Google

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and I'd like to talk today
about what happens

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when you do a web search.

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

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you aren't actually searching the web, 
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
called spiders.

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

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

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and fetch the pages they link to 
and so on

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

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many billions of pages stored
across thousands of machines.

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

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

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Our software searches our index
to find every page

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that includes those search terms.

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

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How does Google decide 
which few documents I really want?

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By asking questions, 
more than 200 of them.

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

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Do the words appear in the title,
in the URL, directly adjacent?

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Does the page include synonyms
for those words?

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Is this page from a quality website 
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,
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
to it, and how important those links are.

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Finally, we combine all
those factors together

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

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about half a second
after you submit your search.

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At Google, we take our commitment
to delivering useful

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and impartial search results
very seriously.

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

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update it more often,
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,
a URL, and a snippet of text

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

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I also see links to similar pages,

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Google's most recent
stored version of that page,

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and related searches 
that I might want to try next.

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

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We take our advertising business
very seriously as well,

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both our commitment to deliver the best
possible audience for advertisers

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

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We're very careful to distinguish your ads
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
will help you find the information

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you're looking for 
which, in this case,

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

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Thanks for watching,

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I hope this made Google
a little bit more understandable.