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An integer stores a whole number. The exact range depends on the language; in Java, "int" stores whole numbers in a range of approximately minus 2 billion to plus to billion.

A boolean variable, on the other hand, stores only one of two values - these are often called "true" and "false" (as in Java). Boolean variables are often used to keep track of information that can be thought of as a reply to a "yes/no" question. For example, to mark whether a certain item is active or not you have only two choices, so it makes sense to use a boolean variable.

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