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Search tools Presentation Transcript

  • 1. Search ToolsChapter 3 | Searching theWeb
  • 2. Outcomes Studentswill be able to describe the three major types of search tools
  • 3. Search ToolsSearch Engines, Directories, and Meta-SearchEngines… OH MY!
  • 4. Chapter 3: Searching the WebDirectoriesA human-compiled hierarchical list of Web pages Organizes links in categories and subcategories Users drill down through categories and subcategories to find specific information 4
  • 5. Chapter 3: Searching the WebDirectoriesA breadcrumb trail shows the hierarchical arrangement of categories and subcategories through which you have clicked Yahoo! was one of the first directories 5
  • 6. Chapter 3: Searching the WebSearch Engines Three major components  Spider, Bot, or Web crawler  Index  Search engine software 6
  • 7. Chapter 3: Searching the WebSearch EnginesA spider or bot automatically browses the Web going from link to link to add and update its Web page index Search engine software compares search keywords to index and presents search results list 7
  • 8. Chapter 3: Searching the WebSearch Engines Typical information collected by a spider  Page title, URL, meta tag keywords  Occurrence of keywords in page  All of the words on the page  Internal links  Number and relevancy of other pages that link to the page 8
  • 9. Search Engines Search engines use different algorithms to rank Web pages in a search results list Most search engines also include paid or sponsored listings on the search results page
  • 10. Chapter 3: Searching the WebSearch Engines Some search tools provide special toolbars you can download as browser plug-ins 10
  • 11. Chapter 3: Searching the WebMeta-Search Engines Compilesthe search results from multiple search engines into one list  Some eliminate duplicates  Watch for paid or sponsored listings in search results list  metacrawler  Dogpile  Mamma  Ixquick 11
  • 12. The EndPlease proceed to the next lesson activity!