How Google search works ppt
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How Google search works ppt
- 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
- 6. Keyword in Title Inside <title> tag Keyword in link Keyword in <h1> Tag or in description
- 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.
- 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