Question

what is the real number?

Answer 1

The combination of rational numbers and irrational numbers is called real number
e.g 3,-8,6/7,√5 etc.

Answer 2

The real numbers include all the rational numbers, such as the integer −5 and the fraction 4/3, and all the irrational numbers, such as √2 (1.41421356..., the square root of 2, an irrational algebraic number).
Real number is a combination of both rational and irrational numbers.