Possibility = It can happen | Probability = It's likely to happen Possibility - means something is able to happen, it's not impossible. Example: “There’s a possibility it will rain tomorrow.” Probability - This is about how likely something is, often with a number or percentage. Example: “There’s a 70% probability it will rain tomorrow.”

"Possible" and "probable" are everyday English. "Possibility" has a broad meaning. Oddly, "probability" has a narrow, almost technical meaning, and often refers to a specific percentage estimate. This is probably because of the mathematical theories of probability and statistics. Suppose you flip a fair coin ten times in a row. The two sides of a coin are called the "head" and the "tail." You can say: "It is possible that you could get 'heads' ten times in a row." "However, is probable that you would get 'tails' at least once." "Getting ten 'heads' in a row is a possibility.." You could NOT say "Getting 'tails' at least once is a probability." You COULD say "The is a 99.9% probability of getting 'tails' at least once."