Answer:A rational number is best defined as any number that can be expressed as a fraction \frac{a}{b} , where a and b are integers, and b is not equal to zero. This means that rational numbers include whole numbers, fractions, and terminating or repeating decimals, as they can all be represented in this fraction form. For example, the number 3 can be expressed as \frac{3}{1} , and the decimal 0.75 can be written as \frac{3}{4} . In contrast, numbers that cannot be expressed in this way, such as the square root of 2 or π, are classified as irrational numbers.