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  1. 1. Search Engines Emphasis on
  2. 2. Discovery <ul><li>Discovery is done by browsing & searching data on the Web. </li></ul><ul><li>There are 2 main types of search facilities available on the Web: </li></ul><ul><ul><li>Search engines (e.g., Altavista, Google) maintain an index of hundreds of millions of Web pages and use that index to find pages that match a set of user-specified keywords. </li></ul></ul><ul><ul><ul><li>General Search Engines </li></ul></ul></ul><ul><ul><ul><li>Meta Search (meta crawler, dogpile) </li></ul></ul></ul><ul><ul><ul><li>Pay Per Click (Overture, FindWhat) </li></ul></ul></ul><ul><ul><ul><li>Searchable databases – “Invisible Web” </li></ul></ul></ul><ul><ul><ul><ul><li>i.e – Library Databases </li></ul></ul></ul></ul><ul><ul><li>Directories (e.g., Yahoo!, provide a hierarchically organized collection of links to Web pages. </li></ul></ul><ul><ul><ul><li>Subject Guides (, Ask Jeeves) </li></ul></ul></ul>
  3. 3. Other Types <ul><li>Shopping (mySimon, Amazon) </li></ul><ul><li>News (Google News) </li></ul><ul><li>People (Switchboard) </li></ul><ul><li>Computing/Internet ( </li></ul><ul><li>Business ( </li></ul><ul><li>Entertainment (Movies – </li></ul>
  4. 4. Web-browsing Assisting Agents <ul><li>Intelligent Agents are computer programs that carry out a set of routine computer tasks on behalf of the user. </li></ul><ul><li>Some agents can facilitate browsing by offering the user a tour guide of the Internet. They work while the user browses. </li></ul><ul><li>FAQ agents guide people to answers of frequently asked questions. </li></ul><ul><ul><li>The agent (such as FAQFinder) addresses large numbers of FAQ files and provides an interface by which people can post their questions. </li></ul></ul><ul><ul><li>AskJeeves ( ) is an example of a FAQ assistant. </li></ul></ul>
  5. 5. Web-browsing Assisting Agents (cont.) <ul><li>Web robots , spiders , and wanderers travel the Web and perform tasks such as information retrieval and discovery, validating links or HTML, and generating statistics. </li></ul><ul><li>Indexing agents can carry out a massive autonomous search of the Web on behalf of a user or, more commonly, of a search engine . </li></ul><ul><li>Metasearch engines integrate the findings of the various search engines to answer queries posted by the users. </li></ul><ul><li>Internet softbots attempt to determine more specifically what the user wants and can better focus a search. </li></ul>
  6. 6. Google <ul><li>Web </li></ul><ul><li>Images </li></ul><ul><li>Groups </li></ul><ul><li>Directory </li></ul><ul><li>News – 4,500 news sources </li></ul><ul><li>Language Translator </li></ul>
  7. 7. Google “Web” <ul><li>Search – Limit Searches </li></ul><ul><ul><li>Articles – search site:company </li></ul></ul><ul><ul><li>US Government sites – </li></ul></ul><ul><li>Features </li></ul><ul><ul><li>Calculator </li></ul></ul><ul><ul><li>Definitions </li></ul></ul><ul><ul><li>Phone # search – enter phone # or phonebook:name city </li></ul></ul><ul><ul><li>Stocks – stocks:ibm </li></ul></ul>
  8. 8. Google Services & Tools <ul><li>Search Bar – Plug-in for web browser </li></ul><ul><li>Voice Search </li></ul><ul><li>Blogger </li></ul><ul><li>Froogle (Product search/comparison tool </li></ul><ul><li>Catalogs </li></ul><ul><li>Labs </li></ul><ul><li>Language </li></ul><ul><li>University Search </li></ul>