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  • 1. Topic 3 INTERNET TECHNOLOGY3.2 The Internet 3.2.2 World Wide Web Information Searching 1
  • 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. 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. 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. 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. 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. Information Searching Examples of search engine: Search Engine Web Address Year Google .com 1998 Yahoo! 2002 Excite Lycos 1994 AllTheWeb AltaVista HotBot Ask Jeeves WebCrawlerTM MSN Search Infoseek 1994 7
  • 8. Information Searching 8
  • 9. Information Searching Search operators can help to refine your search: 9
  • 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 .com Yahoo! Excite Gigablast MSN Open Directory Project 10
  • 11. Information Searching 11
  • 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. Information Searching Example of subject directory: 13
  • 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