# What is the differena

jalaldn
what is the differenae between natural and real numbers

Real numbers (R) are "all" numbers, so all the fractions and all the other (irrational) numbers like $\sqrt{2}$ and $\pi$. If you want, you can think about a real number as any number which can be written in a (infinite, repeating or non-repeating) decimal expansion, like 1.23495012398530913298.......
(Sometimes, blackboard bold notation is used, for example $\mathbb{N}, \mathbb{R}$ instead of N, R.