An integer is a whole number that can be positive, negative, or zero. It is an element of the set of whole numbers from zero to positive or negative infinity. Integers are not decimals or fractions, but rather whole numbers. They are used in many areas of mathematics, including algebra and number theory. To summarize:

• An integer is a whole number that can be positive, negative, or zero.
• It is an element of the set of whole numbers from zero to positive or negative infinity.
• Integers are not decimals or fractions, but rather whole numbers.