ELI5: Explain Like I'm 5

Rationality

Rationality is the ability to make logical and sensible decisions. It means that you can think through things logically and make decisions based on facts and reality, instead of emotions or wishful thinking. For example, if someone offered to buy you a new toy, but you knew that you would have to save the money to buy something else that you really needed, being rational would mean that you would choose to save the money instead of buying the toy.