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how google works

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all about working of google search engine

all about working of google search engine

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    how google works how google works Presentation Transcript

    • RUCHIR KUMAR GUPTA BTECH FINAL YEAR(I.T.) 0701013084
      • CONTENTS
      • INTRODUCTION
      • HISTORY
      • WORKING
      • TYPES OF SERCH ENGINE
      • ADVANTAGES
      • CONCLUSION
    • INTRODUCTION
      • Search engine is a software program that searches for sites based on the words that you designate as search terms.
      • Search engines look through their own databases of information in order to find what it is that you are looking for.
      • “ Search engine” is the popular term for an Information Retrieval (IR) system.
    • HISTORY
      • Archie – First search tool for the Internet
      • Gopher – indexed plain text documents
      • Jughead – searched the files stored in Gopher index system.
      • Wandex – first Web search engine
    • How do Search Engine Works
      • Spiders
      • Robots
    • FORMULA
      • Larry Page and Sergin Brin at Stanford University gave it.
      •  
      • PA=(1-d)+d (PR(T1))/C (T1)+…+PR (Tn)/C (Tn)
      •   Where
      •   PR(A): Page Rank of page A
      •   PR(Ti): Page Rank of pages Ti which link to page A.
      •   C(Ti): the no of outbound link on page Ti d: damping factor in the range of 0<d<1,usually set to 0.85.
      • The highest the PR, the better the inbound link, so it would seem.
    •  
    •  
    •  
    •  
    • APPROXIMATING RELEVANCE
      • Statistical similarity is used to estimate the relevance of an query to answer.
      • Consider the query MAHENDRA SINGH DHONI
      • 1) A good answer contains all three words,and more frequently the better,we called this term frequency (TF).
      • 2) Some query terms are are more important-have the discriminatory power-better than others.
    • Resolving a Query
      • Consider ( cat hat mat )
      • Select a word from query ( “cat” )
      • Retrieve the list for the word cat
      • Find the best ranked document and look up the mapping table.
      • Retrieve and Summarize the docs.
    • Search Engine Modules :
      • A document processor
      • A query processor
      • A search and matching function
      • A ranking capability
      • Summarizing and Presenting documents.
    • TYPES OF SEARCH ENGINE
      • Crawler-Based Search Engines
      • Human-Powered Directories
      • Hybrid Search Engines&quot; Or Mixed Results
      • Google use spiders
      • Large index of keywords .
      • Google’s PAGE RANK .
      • 1.frequency and location of keywords within the Web page
      • 2. Web page history.
      • 3. number of other Web pages that link to the page in question
      • ADVANTAGES
      • It organizes the world ‘s information.
      • It makes the information universally accessible.
      • It makes the information useful.
      • Helps people to interact one another.
      • Helps to know about the products and goods.
      • Helps the people to know about the society.
      • Any information can be gathered from google.
    • CONCLUSION
      • Search engine plays important role in accessing the content over the internet, it fetches the pages requested by the user.
      •   It made the internet and accessing the information just a click away.
      • The need for better search engines only increases
      • The search engine sites are among the most popular websites.
    •