Question

what is meant by real numbers

Answer 1

rational+irrational numbers are real numbers numbers
An imaginary number is a complexnumber that can be written as a realnumber multiplied by the imaginaryunit i, which is defined by its property i2 = −1. The square of an imaginary number bi is −b2. For example, 5i is animaginary number, and its square is −25.

Answer 2

Numbers which are not imaginary are called real numbers. They can be integers, rational numbers, irrational numbers , etc.