1 Searching the Web. 2 Lecture Outline The search process The search tools Advanced search techniques.

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Presentation transcript:

1 Searching the Web

2 Lecture Outline The search process The search tools Advanced search techniques

3 The Search Process It involves choosing the best search tool for the job, formulating the search query, examining the search results, and evaluating the credibility of the web pages listed in a search results list.

4 What Are the Different Types of Search Tools?? Directories Search Engines Metasearch Engines

5 Directories A directory is a human-complied index of web pages organized into hierarchical categories and subcategories.

6

7 Examples of General Web Directories Yahoo ( Galaxy ( Eyoon ( Nesnas (

8 Search Engine A search engine uses a software program called a spider to browse the web and compile a searchable index without human intervention.

9

10 Examples of Web Search Engines... Google ( Altavista ( Excite ( Lycos ( Ayna (

11 Metasearch Engine A metasearch engine sends a search query to several search engines simultaneously and then compiles the results into a single list, eliminating duplicates.

12

13 Examples of Metasearch Engines... Dogpile ( Ixquick ( MetaCrawler (

14 Advanced Search Techniques It allows users to restrict the results by what words include or exclude. It involve using Boolean operators and quotations.

15 Boolean Logic for Searches AND---requires both terms dogs AND cats OR-----finds either term dogs OR cats NOT---excludes term dogs NOT cats Quotation marks " " ---Requires words to searched as a phrase, in the exact order you type them "animals farm"

16 3 Documents 1 Document ? Dogs NOT Cats ? Dogs AND Cats ? Dogs OR Cats Try It Yourself!!