The combination of rational and irrational numbers makes the set of real numbers represented by $\mathbb{R}.$ Represented by a graph, the set of real numbers is formed by continuous values marked on a number line. Real numbers are the numbers that can be found in the real world. For instance, natural numbers are used for counting objects, rational numbers are used for representing fractions, irrational numbers are used for calculating the square root of a number, integers for measuring temperature, and so on. These different types of numbers make a collection of real numbers.