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How Google Search Works (in 5 minutes) - YouTube
Channel: Google
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every day billions of people come here
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with questions about all kinds of things
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sometimes we even get questions about
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google search itself like how this whole
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thing actually works and while this is a
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subject entire books have been written
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about there's a good chance you're in
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the market for something a little more
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concise
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so let's say it's getting close to
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dinner and you want a recipe for lasagna
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probably seen this before but let's go a
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little deeper
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since the beginning back when the
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homepage looked like this
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google has been continuously mapping the
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web hundreds of billions of pages to
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create something called an index
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think of it as the giant library we look
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through whenever you do a search for
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lasagna or anything else
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now the word lasagna shows up a lot on
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the web pages about the history of
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lasagna articles by scientists whose
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last name happened to be lasagna stuff
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other people might be looking for but if
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you're hungry randomly clicking through
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millions of links is no fun
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this is where google's ranking
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algorithms come into play
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first they try to understand what you're
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looking for
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so they can be helpful even if you don't
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know exactly the right words to use or
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if your spelling is a little off then
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they sift through millions of possible
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matches in the index and automatically
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assemble a page that tries to put the
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most relevant information up top for you
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to choose from
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okay now we have some results but how
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did the algorithms actually decide what
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made it onto the first page
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there are hundreds of factors that go
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into ranking search results so let's
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talk about a few of them
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you may already know that pages
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containing the words you search for are
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more likely to end up at the top no
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surprise there but the location of those
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words like in the page's title or in an
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image's caption those are factors too
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there's a lot more to ranking than just
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words back when google got started we
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looked at how pages linked to each other
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to better understand what pages were
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about and how important and trustworthy
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they seemed
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today linking is still an important
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factor another factor is location where
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a search happens because if you happen
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to be in oromea italy you might be
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looking for information about their
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annual lasagna festival but if you're in
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omaha nebraska you probably aren't
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when a webpage was uploaded is an
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important factor too
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pages published more recently often have
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more accurate information especially in
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the case of a rapidly developing news
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story
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of course not every site on the web is
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trying to be helpful just like with
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robocalls on your phone or spam in your
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email there are a lot of sites that only
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exist to scam and every day scammers
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upload millions more of them so just
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because
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instantvirusdownload.net lists the words
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lasagna recipe 400 times that doesn't
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mean it's going to help you make dinner
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we spend a lot of time trying to stay
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one step ahead of tricks like these
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making sure our algorithms can recognize
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scam sites and flag them before they
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make it to your search results page
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so let's review billions of times a day
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whenever someone searches for lasagna or
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resume writing tips or how to swaddle a
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baby or anything else google software
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locates all the potentially relevant
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results on the web removes all the spam
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and ranks them based on hundreds of
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factors like keywords links location and
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freshness
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okay good time to take a breath
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this last part is about how we make
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changes to search and it's important
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since 1998 when google went online
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people seem to have found our results
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pretty helpful
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but the web is always changing and
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people are always searching for new
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things
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in fact one in every seven searches is
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for something that's never been typed
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into the search box before by anyone
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ever so we're always working in updates
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to search thousands every year which
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brings up a big question how do we
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decide whether a change is making search
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more helpful
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well one of the ways we evaluate
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potential updates to search is by asking
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people like you every day thousands of
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search quality raters look at samples of
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search results side by side then give
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feedback about the relevance and
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reliability of the information
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to make sure those evaluations are
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consistent the raters follow a list of
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search quality evaluator guidelines
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think of them as our publicly available
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guide to what makes a good result good
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oh and one last thing to remember we use
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responses from raiders to evaluate
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changes but they don't directly impact
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how search results are ranked so there
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you have it every time you click search
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our algorithms are analyzing the meaning
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of the words in your search matching
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them to the content on the web
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understanding what content is most
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likely to be helpful and reliable and
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then automatically putting it all
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together in a neatly organized page
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designed to get you the info you need
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all in oh 0.81 seconds wow anyone else
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ready for dinner
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interested in learning more we've got a
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whole website dedicated to how search
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works just click right here
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want to read the search quality raider
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guidelines for yourself click right here
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