Answer:
Rational number can be represented as fraction which has prime numerator and denominator. Rational numbers are either limited or the pattern after some decimals repeats forever. For example
9/7=1.285714285714285714. As you see the pattern repeats limitless. Though Rational numbers can be limited Irrational numbers are always endless.
Often this values/constants are found in geometry like π=3.14, e=2.718, also √2 and so on. The main difference between rational and irrational numbers is that rational numbers can be represented by fraction.