Real numbers include rational numbers and irrational numbers.
Rational numbers are easy to understand because these are the numbers that include integer and fraction.
There are also irrational numbers such as âˆš3.
So, real numbers literally exist in the world.
On the other hand, there are also imaginary numbers which do not exist.
Even though it does not exist, you have to use imaginary numbers to solve some math problems.
Numbers(4)

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Re: Numbers(4)
There are lots of words in the mathematics vocabulary. You have mentioned words which we are using for numbers like rational, irrational, real and imaginary.