Which type of numbers includes all numbers that can be represented on a number line?

Real numbers encompass all numbers that can be represented on a number line, which includes rational numbers (such as fractions and integers) and irrational numbers (such as the square root of two and pi). They can be found everywhere on the number line, which extends infinitely in both the positive and negative directions.

In contrast, complex numbers include a real part and an imaginary part, which cannot be represented on a traditional number line, as they are expressed in the form a + bi, where i is the imaginary unit. Imaginary numbers, specifically, are a subset of complex numbers that exist outside the realm of the real number line and therefore cannot be graphed on it. Integer numbers are also a subset of real numbers, consisting only of whole numbers and their negatives; however, they do not encompass the full range of values found within real numbers, such as fractions or irrational numbers.