Option Delta is a hedge parameter, one of the so-called Greeks. It measures the rate of change of option price in response to changes in the underlying price. In mathematical sense, delta is the first derivative of option price with respect to underlying price.
For Call options, Delta is in the [0;1] range; for Put options, it is in the [-1;0] range.
||The Option Delta plot.|
*For illustrative purposes only. Not a recommendation of a specific security or investment strategy.