Gamma is a derivative of delta, which is the relationship between the price of a derivative and the price of its underlying asset. Gamma is the movement of delta in relation to the price of the underlying asset.

If an option has a high gamma, its price movement in relation to the underlying asset's price movement is volatile. This increases both risk and reward because any price movement in the underlying asset is amplified in the price movement of its option.

Gamma is always greatest when a trade is at the money, and it is smallest when it is deeply in or out of the money.

Gamma is a crucial concept in options trading that measures the rate of change in an option's delta concerning changes in the underlying asset's price. Delta represents the sensitivity of an option's price to fluctuations in the underlying asset. Gamma, often referred to as the "delta of the delta," quantifies how fast the delta itself changes.

As the underlying asset's price moves, gamma reflects the acceleration or deceleration of an option's delta. Options with higher gamma values are more responsive to changes in the underlying asset's price, exhibiting more significant delta changes. Traders and investors use gamma to assess and manage their exposure to market movements, particularly in dynamic or volatile market conditions. Understanding gamma is essential for crafting effective options trading strategies, allowing market participants to adapt to changing circumstances and optimize risk management.