Definition
Volatility trading is the practice of building positions whose profit depends on how much an asset moves, rather than on which direction it moves. A directional trader bets a stock will rise or fall; a volatility trader bets that the stock will be more — or less — turbulent than the market currently expects.
The core comparison is between implied volatility (the move priced into options today) and realized volatility (the move the asset actually delivers). When implied volatility looks too high, a volatility trader sells options; when it looks too low, they buy them. The asset's final direction can be irrelevant.
Why it matters
How it works
A long straddle — buying a call and a put at the same strike — profits if the underlying moves sharply in either direction, regardless of which way. A short straddle profits if the asset stays calm and the options decay. These structures isolate volatility as the variable that matters.
Practitioners watch the gap between implied and realized volatility, often called the volatility risk premium: implied volatility tends to run slightly above realized volatility, which rewards disciplined sellers over time. The catch is asymmetry — sellers collect small, steady premiums but can suffer outsized losses when a rare large move arrives.