Rational numbers are numbers that can be written as a fraction.
Irrational numbers are decimals, that can't be written as a fraction.
3.14 is a rational number.
The square root of 3 is an irrational number
The square root of 2 and 1.3 are irrational numbers.
Hopefully this helps! If you have any more questions or don't understand, feel free to DM me, and I'll get back to you ASAP! :)