If you could know one number that tells you how wild or quiet markets will be next month, you would have a huge advantage—whether you are pricing options, sizing a trade, or managing risk. That number is future volatility, and nobody can know it exactly. But we can build smart forecasts that get us remarkably close. This chapter shows you how, moving from simple quick-and-dirty methods to models that capture the heart of how volatility really behaves, and finally to signals hidden in option prices themselves.