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Lesson 1: Internet Research of Benefits

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Logical Operators

As most of you probably know, the Internet is a vast network of computers with information made available for searching through many databases. The most productive way to search the Internet for information is to use key words or terms with Boolean search techniques, called logical operators. In the example below the key words are underlined.

There are only three operators:

Term
 
Meaning
 
Example
OR
Find sites with at least one of the terms present. Sites containing Cats OR Dogs, OR both will be delivered.
AND
Finds sites with both terms present. Cats AND Dogs will deliver sites with both Cats and Dogs, leaving out Cats-only and Dogs-only sites.
NOT
Finds sites with one term but not the other. Cats NOT Dogs will deliver sites with Cats but no Dogs.