Final answer:
A reason is an explanation or justification for an action or belief, while a sufficient reason is a reason that is complete and satisfactory in itself.
Step-by-step explanation:
A reason is an explanation or justification for an action or belief. It provides evidence or logical support for a conclusion. On the other hand, a sufficient reason is a reason that is complete and satisfactory in itself, without the need for further explanation or justification.
For example, if someone asks why you think it will rain today, you could say that the reason is because the weather forecast predicts rain. However, if you provide a detailed analysis of atmospheric conditions and meteorological data to prove that rain is inevitable, then you have provided a sufficient reason.