When a variable has no value, it considered to be null. Having a null value is different than having a value of 0, since 0 is an actual value. However, when used in a boolean test, both null and zero result in a FALSE value. Programmers often use boolean tests to determine whether a variable has been given a value or not.
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This page contains a technical definition of Null. It explains in computing terminology what Null means and is one of many technical terms in the TechTerms dictionary.
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