Transcript WWW Search - Computer Science

CSCI-235
Micro-Computer in Science
Internet Search
Searching on the Web
 Search
Engines- help to find sites related
to a specific topic.
 One enters queries or keywords, search
engine will return many links containing
those words. Some will rank the relevancy
of the links depending on how many times
the words appeared in the pages.
Search Engine

Each Search engine builds its own database of
web pages.
 Some engines: Google, Altavista, Yahoo, Bing,
Infoseek, Excite
 Google and Altavista return the links containing
the keywords. It brings back too many irrelevant
hits, it is best used for very specific information.
 Yahoo categorizes data and then let you search
when the topic has been narrowed down
somewhat producing more relevant results.
 No search engine is best
Popular Web Search Engines
http://www.altavista.com/
http://www.msn.com/
http://www.go.com/
http://www.excite.com/
http://www.lycos.com
http://www.askjeeves.com/
http://www.webcrawler.com/
http://www.google.com/
http://www.yahoo.com
http://www.search.com/
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Search Techniques
A
search engine has its own searching rules.
 A good guide:
http://www.windweaver.com/searchguide.htm
 Some tips:
 Try multiple search engines on one query
 Use quotes around a string of words
 Use AND , OR, and NOT to narrow down the topic
• And - Includes all findings of both key words
• Or - Looks for only one of the specified key words
• Not - Allows you to exclude certain key words

Use + (-) in front of words to make sure the word is
included (excluded)