Which of the following describes a whole number that does not have a decimal?

The term that best describes a whole number that does not have a decimal is an integer. Integers are a set of numbers that include all positive whole numbers, all negative whole numbers, and zero. They do not contain fractions or decimal components, making them the perfect match for the definition provided in the question.

In contrast, a float refers to a number that does include a decimal point, allowing for the representation of both whole and fractional numbers. A string is a sequence of characters, typically used for text, and doesn't pertain to numerical values at all. Lastly, a decimal typically refers to numbers that are expressed in the base-10 system and can include fractional components, thus not aligning with the definition of a whole number.