1. Search Tools
Chapter 3 | Searching the
Web

2. Outcomes
 Studentswill be able to describe the three
major types of search tools

3. Search Tools
Search Engines, Directories, and Meta-Search
Engines… OH MY!

4. Chapter 3: Searching the
Web
Directories
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
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5. Chapter 3: Searching the
Web
Directories
A breadcrumb trail shows the hierarchical
arrangement of categories and
subcategories through which you have
clicked
 Yahoo! was one of the first directories
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6. Chapter 3: Searching the
Web
Search Engines
 Three major components
 Spider, Bot, or Web crawler
 Index
 Search engine software
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7. Chapter 3: Searching the
Web
Search 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
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8. Chapter 3: Searching the
Web
Search 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
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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
Web
Search Engines
 Some search tools provide special
toolbars you can download as browser
plug-ins
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11. Chapter 3: Searching the
Web
Meta-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
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12. The End
Please proceed to the next lesson activity!