Gaussian rationals are just a special type of number. The numbers are made up of two parts: a numerator and a denominator. The numerator is a whole number, and the denominator is another whole number, but it usually has a number with a lot of zeros after it. For example, you can have the number 11/100000000. This number can also be written in a different way called an exponential form. That would be 0.000000011. Gaussian rationals are used in calculations that involve fractions and many other things.