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Basics of Search Engines and Algorithms
The document outlines the history and architecture of search engines, detailing the development of key players like Google and its algorithms, including PageRank. It explains how search engines work through crawling, indexing, and the processing of user queries, along with updates to combat spam such as the Panda and Penguin algorithms. Additionally, it discusses search engine results pages (SERP) and the importance of click-through rates (CTR) in measuring user engagement.
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Basics of Search Engines and Algorithms
- 1. Search Engine Optimization HowSearch Engine Works ? Presented by Mohammed Azharuddin
- 2. Contact Info • Facebook:Md Azharuddin Barkati • Twitter : mdazhar01 • Gmail : azhar.itguy@gmail.com
- 3. History of Search •1990 – Archi Query Form – FTP based file search engine • Feb 1993 – Excite.com – General word relation based search • Oct 1993 – AliWeb – Manual submission engine • Jan 1994 – Altavista – First natural language search engine
- 4. • Jan 1996– Backrup – Started by Larry Page and Segrey Brin • Sep 15 1997 – Google.com – First search engine with Page Rank Technology • 1997 – Yandex.com – Russian based search engine • 1998 – MSN Search – Microsoft Rival to Google
- 5. • 2000 –Baidu.com – Chinese based search engine • 2008 – duckduckgo.com – Non tracking search engine • 2009 – Bing.com – Microsoft Rival to Google • 2010 – Blekko.com – Spam and Virus free search http://www.searchenginehistory.com/ http://www.google.co.in/about/company/history/ http://www.wordstream.com/articles/internet-search-engines-history
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- 7. Search Engine Architecture •Every search engine is based on following –Crawling –Indexing –Algorithms –Results –Fight Spam
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- 9. Search Engine Architecture Crawler Store Indexer 100Million GB indexes indexes Search Interface Algorithms (Programs) trash trash trash Sorted based on Content / Factors WWW 60 Trillion Pages Or 60 Lakh CroreLive Google Example
- 10. Algorithms • Programs andFormulas to get relevant results – Page Rank – Spelling Check – Synonym check – Auto complete – Query Understanding – Safe Search – User Context
- 11. Page Rank Algorithm •Google's first algorithms, which looks at links between pages to determine their relevance. • PR is a number generated for each page available in Google Index • PR Toolbar Range – NA to 10 (Best Rank) : This is based on Log Scale of 0 – 10 • Real Page rank is calculated based on number of pages in index, which can be 0.15 to Trillions
- 12. Toolbar Vs. RealPR Toolbar Real PR 0 0 - 10 1 100 - 1,000 2 1,000 – 10,000 3 10,000 – 100000 4 100000 – 1000000 5 1000000 - 10000000 http://www.webworkshop.net/pagerank_calculator.php3
- 13. PR Formula Updated Formula OldFormula D = Damping Factor ; PR(N) = PR of Linking Site ; L(N) : No of Outbound Links
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- 15. Fighting Spam • Spamrefers to websites which uses un ethical practices for Search Rankings • To fight the spam Google release updates frequently called as “Algorithm Updates” • Google changes its search algorithm around 500 – 600 times every year. • Some of them are major and few are minor updates
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- 18. • Panda Update- February 23, 2011 – This algorithm target the sites with thin content, content farms, duplicate content, sites with high ad-to-content ratios, and a number of other quality issues. – Affected 12% queries on launch – Recent update : Panda 4 – May 19 2013
- 20. • Penguin Update– April 24, 2012 – This algorithm target the sites which over optimize the websites, uses excessive links. – Affected 3% queries on launch – Recent update : Pengiun 2.1 – Oct 4 2014
- 22. Humming Bird Update– August 2013 • This algorithm understands the context of the query by analyzing the words in query • It can automatically rewrite the query internally based on certain words like “Near”, Vs, How to, Where, Who is …. Etc • Many queries are provided as “ONE BOX ANSWERS” to give the quick answers.
- 23. How it Works? User Query Query Translator Modified Query Index
- 24. One Box AnswersQueries • When is Independence of India • Time in India or Time in Toronto • 1$ to INR • 1Mile to Kms • Banana Vs. Apple • Who is wife of Bill Gates • What is my IP • who invented www • Show me pictures of taj mahal
- 25. Search Engine ResultsPage (SERP)
- 27. Types of Results PaidResults PPC Ads Comparison Ads Shopping Ads Non Paid Results Organic Web News Results Image Results Local Results Video Results Site Links Schema Data
- 28. Click Through Rate(CTR) • CTR is a measure to understand how many users are clicking on the site from SERP • CTR helps to understand the user response • The top four positions “above the fold” for many desktop users, receive 83% of first page organic clicks. CTR = (No of Clicks/No of Impressions)x100
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- 31. Branded Vs. UnBranded
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