Attack moves are used to get past a defender when they are on a close out and are scrambling toward the offensive player with the ball. Their momentum is carrying them away from the basket, making them vulnerable to an aggressive move toward the basket.
The jab series of basketball drills are best used when a defender is closing out on balance but you have already been able to use other attack moves against them. The goal is to use the jab step to force a reaction. Based on the reaction, the offensive player can decide which move in the series to use.
The key to a great jab step is to make it quick, about 8″-12″ while staying on balance. Based on the reaction of the defender, the offensive player can continue to attack in the direction of the jab step, attack opposite, or step back for a shot.