SEARCH ENGINES

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SEARCH ENGINES

  1. 1. SEARCH ENGINES AnGeL SoPhiE
  2. 2. What is SEARCH ENGINES? A search engine is a program that finds web sites and web pages. Below are examples of popular search engines. google.com yahoo.com askkids.com metacrawler.com about.com Using a search engine, you can easily find the web pages you need. Simply enter a word or a phrase, called search text or keywords, in the search engine’s box. AnGeL SoPhiE
  3. 3. Two Categories of Search Engines 1. DIRECTORIES  such as about.com and 2. INDEXES yahoo, are good identifying general information.  The results of your search will be a list of web sites related to your search term.  like altavista and google, find individual pages of a web site that match your keyword.  They search all the contents of a web site, analyzing millions of web pages and indexing all of the words. AnGeL SoPhiE
  4. 4. ADVANCED WEB SEARCHING  CAPITALIZATION – most search engines are NOT case sensitive.  PHRASE SEARCHING – when using a phrase as keyword, enclose the words in quotation marks (“”) so that the search engine will return only documents containing the exact phrase.  ASTERISKS – if you are looking for information on astronomy, you could use it as your keyword. --use a root part of word & abbreviate it with an asterisk….ex. Astro* AnGeL SoPhiE
  5. 5. ADVANCED WEB SEARCHING  BOOLEAN OPERATORS – the English mathematician George Boole developed a way that has become the basis for computer searches. Boole used words called operators to determine whether a statement is true or false. AnGeL SoPhiE
  6. 6. Most common operators AND OR NOT printer AND color printer OR color printer NOT color Printer and color The search engine looks only for pages that include both terms and ignores pages that include only one of them. The search engine looks for pages that include either or both of the terms. AnGeL SoPhiE The search engine looks for pages that include the term printer but do not include the term color. The search engine ignores any pages that include both terms.
  7. 7. ADVANCED WEB SEARCHING  +REQUIRE and -EXCLUDE – some engines offer a variation of the Boolean operators AND and NOT. A + symbol preceding a keyword (with no space between) requires that the word be present in documents. A – symbol preceding a keyword ensures that the word is not present in returned documents. Example: +computer+virus AnGeL SoPhiE
  8. 8. reference  The Amazing World of Computers 5 Lesson 4, Page 43-48 AnGeL SoPhiE
  9. 9. Thank you!!! AnGeL SoPhiE

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