Nearly any number you can think of is a Real Number.
Real Numbers include:
- Whole Numbers (like 0, 1, 2, 3, 4, etc)
- Rational Numbers (like 3/4, 0.125, 0.333…, 1.1, etc )
- Irrational Numbers (like π, √2, etc )
Real Numbers can also be positive, negative or zero.
So what is NOT a Real Number?
- Imaginary Numbers like √−1 (the square root of minus 1) are not Real Number
- Infinity is not a Real Number
This diagram may help you to understand better: