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Introduction

Introduction. Directories, Search Engines, and Metasearch Engines Search Fundamentals Search Strategies How Does a Search Engine Work?. Directories, Search Engines, and Metasearch Engines. Directories Popular Directories Search Engines Popular Search Engines

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Introduction

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  1. Introduction • Directories, Search Engines, and Metasearch Engines • Search Fundamentals • Search Strategies • How Does a Search Engine Work? From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  2. Directories, Search Engines, and Metasearch Engines Directories Popular Directories Search Engines Popular Search Engines Metasearch Engines Popular Metasearch Engines White Pages From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  3. Hierarchical representation of hyperlinks Top level of general topics Sublevels of more specialized subtopics Easy to use Not necessary to know exactly what looking for Directories, Search Engines, and Metasearch Engines Directories From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  4. Directories • General directory • Web directory • Web guide • Subject directory • Yahoo! --- www.yahoo.com • Specialized • Subject guides • Gateway pages • Financial aid resource center --- www.theoldschool.org From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  5. AOL NetFind CNET Search.com Excite Infoseek Looksmart Lycos Yahoo! Directories, Search Engines, and Metasearch Engines Popular Directories From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  6. Computer program: Accepts form containing query Searches database Returns URL Permits query revision Specific Query syntax Directories, Search Engines, and Metasearch Engines Search Engines From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  7. Search Engines • General search engine • Google --- www.google.com • Specialty search engine • Vertical search engine • Topic search engine • MySimon --- www.mysimon.com From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  8. AOL NetFind AltaVista Excite HotBot InfoSeek Lycos WebCrawler Google Directories, Search Engines, and Metasearch Engines Popular Search Engines From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  9. All-in-one search engine Call other search engines Use single query More matches Directories, Search Engines, and Metasearch Engines Metasearch Engines From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  10. Metasearch Metacrawler MetaFind SavvySearch Directories, Search Engines, and Metasearch Engines Popular Metasearch Engines From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  11. Information about individuals Bigfoot Four11 WhoWhere Yellow pages Directories, Search Engines, and Metasearch Engines White Pages From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  12. Search Fundamentals Introduction Search Terminology Pattern Matching Queries Boolean Queries Search Domain Search Subjects From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  13. Information bar Search form area Directory area Links Search Fundamentals Introduction From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  14. Search tool Query Query syntax Query semantics Hit Match Relevancy score Search Fundamentals Search Terminology From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  15. Search Fundamentals Pattern Matching Queries • Enter keyword(s) • Search engine returns URLs Boolean Queries • George Boole • AND, OR, and NOT From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  16. Search Fundamentals From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  17. Current web Newsgroups Specialized databases Internet Search Fundamentals Search Domain From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  18. A way to view the search queries of anonymous users in real time How busy “Spy” on other users “See” modifications Various interests Personal interests Search Fundamentals Search Subjects From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  19. Search Fundamentals Search Strategies Introduction Too Few Hits: Search Generalization Too Many Hits: Search Specialization From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  20. Determine which search engine to use: User-friendly interface Documentation Conveniently accessible Database size Relevancy scores Search Strategies Introduction From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  21. Eliminate keywords Remove AND or NOT Enlarge search domain General keywords Directory or metasearch engine Search Strategies Too Few Hits: Search Generalization From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  22. Add keywords Add AND or NOT Capitalize proper nouns Use first 20 URLs Directory Search Strategies Too Many Hits: SearchSpecialization From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  23. How Does a Search Engine Work? Search Engine Components User Interface Searcher Evaluator Gatherer Indexer From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  24. User interface Searcher Evaluator Gatherer Indexer How Does a Search Engine Work? Search Engine Components From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  25. Submit queries Display results Relevancy scores Matched page summaries How Does a Search Engine Work? User Interface Searcher • Program • Searches database for matches From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  26. Locates URLs Result set Factors affecting relevancy score: Times query words appear in page Query words in title Query words in CONTENT attribute Number of query words appearing in document How Does a Search Engine Work? Evaluator From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  27. Traverses Web Breadth-first search In levels “across” pages Depth-first search Chain of hyperlinks “down” How Does a Search Engine Work? Gatherer From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  28. How Does a Search Engine Work? From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  29. How Does a Search Engine Work? From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  30. Miscellaneous facts: Heavy load on Web servers Restricted depth of searches Trouble with framed documents Dependent on collection of documents Full text indexing How Does a Search Engine Work? Gatherer From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

  31. Organizes (indexes) gathered data URL Document title Descriptive keywords How Does a Search Engine Work? Indexer From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web

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