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Internet searchingnewver

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  • Explain that the information on the web won’t be arranged in any way (very different from library arrangement)

Internet searchingnewver Presentation Transcript

  • 1. Internet Searching
  • 2. Group Members
    Nashfa
    1
    Zabir
    2
    Visala
    3
    Azhar
    4
    Zaha
    5
  • 3. Contents
    Introduction
    1
    Directories
    2
    Search Engines
    3
    MetaSearch Engines
    4
    Search Strategies
    5
  • 4. Introduction
    With the arrival of the WWW came the widespread availability of online information
    Answers to your questions are somewhere on the web, but how do you locate them?
  • 5. DIRECTORIES
    Method of finding and organizing web information
    Offers a hierarchical representation of hyperlinks to web pages and presentations broken down to topics and subtopics
    Review and classified by human editors
  • 6. Directories : classification
    General
    Specialized
    • Also called web directory or subject directory
    • 7. Top level provides a wide range of broad topics. E.g. Music / Entertainment.
    • 8. Also called subject guides or gateway pages
    • 9. Deals with a variety of topics. E.g. law, medicine.
    Benefits
    Easy to use
    Need not know what you are looking for
  • 10. Search Engines : introduction
    A computer program
    Submit a query describing the information you want to locate
    Searches its databases to try and match your query
    Collates and returns a list of URL’s which matches your query
    Permits you to revise and resubmit a query
  • 11. Search engines : classification
    General
    Specialized
    • Also called vertical search engine or a topic search engine
    • 12. Retrieves information from a database that contains information on a wide variety of topics
    • 13. Provides in-depth information on specific topics that may be valuable
    • 14. Exists for a multitude of topics
    • 15. MP3s
    • 16. Shopping
    • 17. News etc
    Not as easy to use as directories. WHY??
  • 18. Metasearch Engines
    Does not have their own database of information
    Calls many search engines to do the actual work
    Advantage:
    You can access a number of different search engines with a single query
    Disadvantage:
    You will get a lot of results which will not be of interest to you. Therefore you will spend a lot of time evaluating the results and deciding which link to follow
  • 19. Directories and search engines : Popular
    MetaSearch Engines
    Directories
    Search Engines
  • 20. Boolean Queries : AND operator
    B
    A
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  • 21. Boolean Queries : OR operator
    B
    A
    B
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  • 22. Search Strategies
    Determine which search engine
    Possesses a user-friendly interface
    Has a easy-to-understand, comprehensive documentation
    Is convenient to access; that is you do not have to wait several minutes before being able to submit a query
    Contains a large database
    Does a good job in assigning relevancy scores
  • 23. Exercise
  • 24.
  • 25. THANK YOU