An integer is a whole number that can be positive, negative, or zero. Examples of integers include -3, 0, and 7. In contrast, numbers like 1.5, -2.3, and 3/4 are not integers because they are either fractions or decimals.
To identify an integer, remember that it must not have any fractional or decimal parts. Therefore, if you are given multiple options, look for the number that meets this criterion.