A retail trader who is long a call and a put on the same stock holds a position with positive Gamma. The Greeks on their statement update in real time, but day-to-day they do nothing — the position simply ages, the time-value bleeds, and at expiration the structure either pays off or it does not. A professional volatility desk holds the same kind of position but does not let it sit.

Every day, sometimes every hour, sometimes every few seconds, the desk adjusts its position in the underlying stock to keep the structure's Delta near zero. The professional is not waiting for a directional outcome at expiration; they are running a continuous mechanical process called Delta-hedging that converts every realized move in the underlying into hedge cash flows. If the realized volatility through expiration exceeds the implied volatility paid for the contract, the cumulative hedge cash flows exceed the option's premium, and the desk is profitable.