0.25 is a rational number
Rational numbers are numbers that you can guess the number that is right after it or know the patterns like:
1.33333333333, 1.23456789, 1.25, 1.50, 1.0110111011110, ect
Irrational Numbers are numbers you cannot guess the number like:
1.844768461648917902179701, or π that has a infinite amount of numbers