Probability is a key concept of option trading. When putting on a trade with a certain reward to risk, it is essential to take into account the probability of the reward really occurring.
The Probabilities shows you: -the probability of the underlying being above/below selected prices
on a certain date
at any time during a selected time frame
Another way to look at probabilities is thinking in standard deviations. For example statistically a price movement stays within 1 standard deviation 68.3% of the time.The Probabilities shows you how likely a move of less than x standard deviations is and calculates the corresponding price targets: