The Rationals are a group of numbers that can be expressed as the fraction of two integers, where the denominator is not zero. This means any number that can be written in the form a/b, where a and b are integers and b ≠ 0, is considered a rational number. Examples include 1/2, 3, and -4/5. Rational numbers can be positive, negative, or zero, and they can be represented on a number line. They also include whole numbers and fractions, making them a fundamental part of mathematics. The set of rational numbers is denoted by the symbol Q.