4. Integer

An Integer data type stores whole numbers.

The numbers can be both positive or negative but they cannot contain decimal points or fractions.

NOTE: Integers cannot store text, characters or symbols.

Also note that currency can be either a 'real' or an 'integer' data type. For small amounts of currency then decimal places would probably be used, so it would be 'real'. But for large amounts e.g. a car or house then it is unlikely that decimal places would be used - then it would be an 'integer' data type.