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1. H O W
Google
SEARCH
W O R K S
Presentation by : Hardik B. Mahant

2. CONTENTS
• Overview about Google
• What actually happens when we
Google
• How Google search works
• Crawling
• Indexing
• Processing
• Calculate relevancy
• Fighting spam
• Retrieving results
• References

3. OVERVIEW ABOUT Google
• Google was founded by Larry Page and Sergey Brin in 1996.
• Located in Mountain View, California.
• Google earns money by advertising, by play store & many more ways.
• Google is running on thousands of computers which runs on
customized version of Linux.
• Google has more than 4,50,000 servers (approx.) around the world.

4. WHAT ACTUALLY
HAPPENS WHEN
WE Google

5. Keyword
Search
Suggestions

6. Keyword in
Title
Inside <title>
tag
Keyword in link
Keyword in
<h1> Tag or in
description

7. Related searches

8. HOW GOOGLE SEARCH WORKS
• Crawling
• Indexing
• Processing
• Calculate relevancy
• Fighting spam
• Retrieving results

9. CRAWLING : FINDING INFORMATION
• Process of fetching all the web pages linked to a website.
• Performed by software, called crawler OR spider OR googlebot.
• The crawl process begins with a list of web addresses from past crawls
& sitemaps provided by website owners.

10. CRAWLING:
FINDING
INFORMATION
Crawlers /
Spiders
Links

11. INDEXING : ORGANIZING INFORMATION
• Google uses the INDEX databases; after every search, the result will be
stored in this DB.
• Process of creating “index” for all the fetched web pages and keeping
them into a giant database from where it can later be retrieved.
• By this, if the another user searches the same keyword, which had
searched before, results for that will be retrieved more faster.

12. NEED OF INDEXING

13. PROCESSING : BY ALGORITHMS
• We want the answer, not trillions of webpages.
• Algorithms are computer programs that look for clues to give you
back exactly what you want.
• Algorithms are the computer processes and formulas that take your
questions and turn them into answers.

14. PROCESSING : BY ALGORITHMS
• For example they have algorithms for reliability & closer results,
-Autocomplete
-Freshness
-Site & page quality
-Safe search
-Synonyms

15. CALCULATING RELEVANCY : BY CONTENT
• Relevancy depends on the number of keyword in a website.
• For e.g. inside <title>, <h1>,<alt> or any other tag, or inside the
description.
• More relevant web page link will be displayed first.
• Google also calculates relevancy by number of user clicks on particular
link for particular search keyword.

16. FIGHTING SPAM : FILTERING CONTENT
• Google fights with spam 24/7 to keep our result relevant.
• Majority of spam removal is automatic.
• Google examine other questionable documents by manually.
• If they find spam, they take manual ACTION (e.g. BAN).
• When they take action, they attempt to notify website owners.
• Site owner can fix their sites, & let Google know.

17. RETRIEVING RESULTS : TO USERS
• This is the last step performed by Google.
• All the retrieved results are shown to user.
• This is most complicated step, but also the most relevant to users.
• The retrieved results are shown as per the relevancy, site quality, &
number of matching keyword in results with matching approximately
about 200 factors.
• Google performs these steps within few seconds.

18. REFERENCES
• https://www.google.co.in/insidesearch/howsearchworks/index.html
• https://www.youtube.com/watch?v=BNHR6IQJGZs
• https://en.wikipedia.org/wiki/Google