Searching the World Wide Web From Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web 1 Introduction Directories, Search.

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Presentation transcript:

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

Searching the World Wide Web 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

Searching the World Wide Web 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

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

Searching the World Wide Web 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

Searching the World Wide Web 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

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

Searching the World Wide Web 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

Searching the World Wide Web 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

Searching the World Wide Web 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

Searching the World Wide Web 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

Searching the World Wide Web 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

Searching the World Wide Web 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

Searching the World Wide Web 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

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

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

Searching the World Wide Web 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

Searching the World Wide Web 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

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

Searching the World Wide Web 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

Searching the World Wide Web 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

Searching the World Wide Web 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: Search Specialization

Searching the World Wide Web 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

Searching the World Wide Web 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

Searching the World Wide Web 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

Searching the World Wide Web 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

Searching the World Wide Web 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

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

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

Searching the World Wide Web 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

Searching the World Wide Web 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