Possibility and probability are two concepts that are often confused, but they have distinct meanings.
Possibility refers to whether something can happen or not. It is a binary concept—either something is possible, or it is not. For example, it is possible for it to rain tomorrow, but it is not possible for the sun to rise in the west.
Probability, on the other hand, is a measure of how likely something is to happen. It is expressed as a number between 0 and 1, where 0 means the event will never happen, and 1 means it is certain to happen. For example, if there is a 70% chance of rain tomorrow, the probability of rain is 0.7.
In summary, possibility is about whether something can occur, while probability is about how likely it is to occur.