Information Searching


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  1. 1. Topic 3 INTERNET TECHNOLOGY3.2 The Internet 3.2.2 World Wide Web Information Searching 1
  2. 2. Learning OutcomeAt the end of this topic, students should be able to: • Explain different ways of information searching. 1. search engine 2. subject directory 2
  3. 3. Information Searching Searching the Web: • A primary reason that people use the Web is to search for specific information, including text, pictures, music, and video. • A search tool is used to locate the information. Eg: Google. AOL Search, Dogpile, HotBot. 3
  4. 4. Information Searching Two types of search tools are search engines and subject directories. Search Subject engine directory Classifies Web Finds information pages in an related to a organized set of specific topic categories 4
  5. 5. Information Searching What is a search engine? • A program that finds Web sites, Web pages, images, videos, news, maps, and other information (information) related to a specific topic. Or • A program that finds information by entering words or phrases called search text. 5
  6. 6. Information Searching Searching information using search engine: Search engines  program used to find Web sites and Web pages by entering words or phrases called search text(also called keyword) • Search engines require that you enter a word or phrase, called search text or search query. • Each word in the search text is known as a keyword. • The results of the search, called hits. (any Web site name that listed as the result or a search) • Result from the search engine can be in the form of: • Images, videos, audio, publications, maps, people or businesses, blogs. 6
  7. 7. Information Searching Examples of search engine: Search Engine Web Address Year Google www.google .com 1998 Yahoo! www.yahoo.com 2002 Excite www.excite.com Lycos www.lycos.com 1994 AllTheWeb www.alltheweb.com AltaVista www.altavista.com HotBot www.hotbot.com Ask Jeeves www.askjeeves.com WebCrawlerTM www.webcrawler.com MSN Search www.search.msn.com Infoseek www.infoseek.com 1994 7
  8. 8. Information Searching 8
  9. 9. Information Searching Search operators can help to refine your search: 9
  10. 10. Information Searching What is a subject directory? • Search tool that classifies Web pages in an organized set of categories and subcategories. • Examples of subject directory: Subject Directory Web Address Google www.google .com Yahoo! www.yahoo.com Excite www.excite.com Gigablast www.gigablast.com MSN www.msn.com Open Directory Project www.dmoz.org 10
  11. 11. Information Searching 11
  12. 12. Information Searching A subject directory provides categorized lists of links arranged by subject. When click on the category link, the subject directory displays a list of subcategory links. The disadvantage: • Users have difficulty deciding which categories to choose from the menus of links presented. 12
  13. 13. Information Searching Example of subject directory: 13
  14. 14. Summary There are two different ways of information searching: 1. Search engine: • Finds information related to a specific topic. 2. Subject directory: • Classifies Web pages in an organized set of categories such as sport, shopping or other related subcategories. 14