Which term describes numbers that can be expressed as a fraction of two integers?

The correct term that describes numbers that can be expressed as a fraction of two integers is rational numbers. Rational numbers include any number that can be represented in the form of (\frac{a}{b}), where (a) and (b) are integers, and (b) is not zero. This definition encompasses both positive and negative fractions, as well as whole numbers (which can be expressed as a fraction with a denominator of 1) and zero (which can be expressed as (\frac{0}{1})).

Understanding rational numbers is essential as they form a critical part of number theory and are foundational for further mathematical concepts. This contrasts with whole numbers and natural numbers, which do not include negative numbers or fractions, and with irrational numbers, which cannot be expressed as a fraction of two integers and include values like (\pi) and the square root of 2. Rational numbers thus have a broad and inclusive definition that allows for a rich variety of numerical expressions.