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Search Engines
Search Engines
Search Engines
Search Engines
Search Engines
Search Engines
Search Engines
Search Engines
Search Engines
Search Engines
Search Engines
Search Engines
Search Engines
Search Engines
Search Engines
Search Engines
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Search Engines


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Search engine basics and types

Search engine basics and types

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    • 1. Search Engines Shamprasad Pujar IGIDR, Mumbai [email_address]
    • 2. Agenda
      • Basics of Internet
      • Basics of Search engine
      • What is a search engine?
      • Functioning of a search engine
      • Methods of indexing or searching
      • Types of Search engines?
      • Advantages of Search engines?
      • Disadvantages of Search engines?
      • Search engines v/s Directories v/s portals
      • Limitations of search engines
      • Q & A
    • 3. Basics of Internet
      • Anybody can publish anything on the net
      • Content and features of sites change very fast
      • No bibliographic control on published information
      • Internet is a self publishing tool-Evaluate
      • Try out multiple sites, while looking for information
      • Subject Directories and Search Engines vary in their contents
      • Subject Directories/Search engines are highly volatile
      • Good source to locate scholarly literature
    • 4. Basics of Search Engines
      • Store millions of pages in their databases
      • Sites are included automatically based on a set criteria. No human interference
      • Search features/scope vary greatly from one to another
      • Good for beginners and experts
      • Good for searching on a narrow topic
      • Search for particular types of documents, file types, etc is possible
      • Search for any kind of information is possible
      • Different search facility is available for sites, images, news, audio/video files, maps etc
    • 5. What is a Search Engine?
      • Search engine is a tool, which helps in retrieving
      • information from the Internet
      • It indexes the web and accordingly builds its databases
      • Each search engine has its own set rules to index
      • websites
      • When the query or keyword is entered in the search
      • box it checks its ‘index’ with the query
      • Relevant matches are retrieved and returned as 'hits' or
      • 'search results‘
    • 6. Functioning of Search Engine?
    • 7. Methods of Indexing and Searching
      • Keywords from meta tags or web pages
      • Boolean (and, or, not)
      • Mathematical symbols (+, * -)
      • Concept /Computational
      • Natural language searching
    • 8. Types of Search Engines
      • General
          • Example: Bing, Google, Gigablast, etc
      • Meta Search Engines
      • Example: Dogpile, etc
      • Subject Specific search engine
      • Example: Scirus, Intute, Entrez, GoPubMed
      • Intelligent/Specialized Search Engines
      • Example: Kosmix, WolframAlpha
      • Deep Web/Invisible web
      • Example: Library catalogues, Databases
      • Scholarly literature
      • Example: Google Scholar, Base, OAISTER, etc
    • 9. Types of Search Engines
      • General Search Engines :
      • Have own database/index
      • Index sites using their software robot/crawler
      • Index sites on their policy
      • Rank web pages based on their policy
      • Meta Search Engines
      • Search different general search engines
      • Components
      • Dispatch mechanism  Interface Agents  Display
    • 10. Types of Search Engines
      • Subject Specific Search Engines:
      • Index sites on particular subject or material
      • Intelligent/Specialized Search Engines:
      • Concept based searching
      • Allow natural language searching
      • Use thesaurus
      • Personalized Services
      • Deepweb or Inivisible Web:
      • Search content stored in searchable databases
      • Scholarly Literature Search Engines
      • Search content from scholarly journals publishers websites/grey literature published from institutes and repositories
    • 11. Advantages of Search Engines
      • Enable to quick search to vast amount of information from one search box
      • Search on a specific type or piece of
      • information is possible
      • Different types of search engines enable to look for specific types of documents
    • 12. Disadvantages of Search Engines
      • Creates information overload
      • Semantic search is not possible
      • Privacy and security is of concern
      • Makes everyone to dependent
    • 13. Search Engines v/s Directories v/s Portals
      • Crawl Web for information
      • Automatic Indexing
      • Change in webpage automatically gets updated
      • Human editing
      • Change in webpage will not automatically updated
      • PORTALS
      • Information put by individuals or organizations
    • 14. Limitations of Search Engines
      • Can not index the entire web. Most of the search engines can index only between 40% and 60% of the web
      • Can not index sites governed by passwords and developed using frames
    • 15.  
    • 16. Q & A
      • Questions and Answers ??