A rational number is a number that is expressed as the ratio of two integers, where the denominator should not be equal to zero. In contrast, an irrational number cannot be expressed in the form of fractions. Rational numbers – The numbers, each of which can be expressed in the form a/b, where a and b both are integers and b not equal to zero.
Irrational numbers – The numbers which are not rational are called irrational numbers.
Real numbers – The numbers which are either rational or irrational are called real numbers.
Rational Numbers are part of the Real Number System. Rational numbers are special because they can be written as a fraction. More specifically, the definition of rational numbers says that any rational number can be written as the ratio of p to q, where p and q are integers and q is not zero.