Search Engines

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Search Engines

  1. 1. Team members <ul><li>Team name: ‘BLUETOOTH’ </li></ul><ul><li>Punch line: ‘Information unplugged’ </li></ul><ul><li>G.Vivekananda </li></ul><ul><li>Gargi garai </li></ul><ul><li>Jayalakshmi </li></ul><ul><li>Joydeep Roy </li></ul><ul><li>Keerthi Kalyan </li></ul>
  2. 2. Contents covered <ul><li>Definition of search engine </li></ul><ul><li>History </li></ul><ul><li>Popular forms of search engines </li></ul><ul><li>How to build a query? </li></ul><ul><li>How search engines work? </li></ul><ul><ul><li>Querying </li></ul></ul><ul><ul><li>Ranking </li></ul></ul><ul><ul><li>Indexing </li></ul></ul><ul><ul><li>Natural language search </li></ul></ul>
  3. 3. Search engines <ul><li>What is a </li></ul><ul><li>search engine??? </li></ul>
  4. 4. Definition <ul><li>A search engine is an information retrieval system designed to help find information stored on a computer system. </li></ul><ul><li>Search engines help us to minimize the time required to find information </li></ul>
  5. 5. Why do we use search engines? <ul><li>With an estimated 800 million web pages finding the one you want is difficult! </li></ul><ul><li>Allows a user to enter words which characterise a required page </li></ul><ul><li>Time taken is less </li></ul>
  6. 6. Popular forms of search engines <ul><li>Web search engine-Searches for information on the World Wide Web. </li></ul><ul><li>Enterprise search engine-Search on </li></ul><ul><li>(a) Intranets </li></ul><ul><li>(b) Personal search engines </li></ul><ul><li>(c) Mobile search engines. </li></ul>
  7. 7. How search engine works? <ul><li>Querying </li></ul><ul><li>Ranking </li></ul><ul><li>Indexing </li></ul><ul><li>Natural language search </li></ul>
  8. 8. Querying <ul><li>Search engines provide an interface to a group of items that enables users to specify criteria about an item of interest and have the engine find the matching items within the group. </li></ul>
  9. 9. Ranking <ul><li>The equality between the desired item and the actual item must be exact. </li></ul><ul><li>It is sometimes far more beneficial. </li></ul><ul><li>Useful to incorporate a more measure of similarity between the desired item(s) and the items that exist in the group being searched. </li></ul>
  10. 10. Indexing <ul><li>A search engine will typically collect information, or metadata, about the group of items under consideration. </li></ul><ul><li>The metadata collected about each item is typically stored on a computer in the form of an index. </li></ul>
  11. 11. Natural language search <ul><li>The term used to describe web search engines that apply natural language processing of some form. </li></ul><ul><li>Traditional search engines tend to use a non-linguistic model of language. </li></ul><ul><li>The results will be more accurate and efficient. </li></ul><ul><li>Most popular language search is </li></ul><ul><li>askjeeves.com </li></ul>
  12. 12. How to build a search <ul><li>The query can be simple or complex </li></ul><ul><li>For complex queries, user can use the boolean operators like </li></ul><ul><li>AND  All the terms must appear </li></ul><ul><li>OR  At least one term must appear </li></ul><ul><li>NOT  Term following not must not appear </li></ul><ul><li>Followed by  One term followed by other </li></ul><ul><li>Quotation mark  Phrase must appear </li></ul>
  13. 13. Search engines <ul><li>Google is the most famous search engine </li></ul><ul><li>The other search engines are: </li></ul><ul><li>altavista </li></ul><ul><li>yahoo! </li></ul><ul><li>netscape </li></ul><ul><li>msn </li></ul><ul><li>AOL </li></ul><ul><li>alexa, etc.. </li></ul>
  14. 14. Uncertainty? Disbelief? Doubt??

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