What is 'Gamma'
Gamma is the rate of change for delta with respect to the underlying asset's price. Gamma is an important measure of the convexity of a derivative's value, in relation to the underlying. In a deltahedge strategy, gamma is sought to be reduced in order to maintain a hedge over a wider price range. A consequence of reducing gamma, however, is that alpha too will be reduced.
BREAKING DOWN 'Gamma'
Mathematically, gamma is the first derivative of delta and is used when trying to gauge the price movement of an option, relative to the amount it is in or out of the money. When the option being measured is deep in or out of the money, gamma is small. When the option is near or at the money, gamma is at its largest. Gamma calculations are most accurate for small changes in the price of the underlying asset.

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Is there a better metric for hedging options than delta?
Learn about delta and gamma hedging options, why gamma is a better metric to use to hedge and how gamma can be used with ... Read Answer >> 
What are the limitations of using delta to hedge options?
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How can you use delta to determine how to hedge options?
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Why does delta only range from 1 to 1?
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What are common delta hedging strategies?
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What industries typically use delta hedging techniques?
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