A zone defense assigns each defender an area of the court to protect rather than a specific opponent, shifting collectively as the ball moves.
Zone defense reorganizes responsibility. Instead of following an assigned opponent anywhere, each defender guards a region, passing attackers between zones and collapsing toward the ball. The common shapes name themselves by their alignment: a 2-3 zone walls off the paint with three defenders along the baseline, a 3-2 extends toward shooters, and box and one hybrids assign one chaser to a star while the rest sit in a zone.
The NBA resisted the zone for decades. Zone defence was effectively illegal under the league's old illegal defence rules, which required defenders to guard a man or commit fully to a double team, until the rule was scrapped in 2001 and zones became legal in full. College basketball, where the zone never left, made it famous instead, and Syracuse's 2-3 became the American game's signature scheme.
Zones remain a change of pace in the NBA rather than a base defence, because professional shooters punish the gaps zones concede, the seams between areas and the corner threes. Quiz questions use zone as the strategic opposite of man to man, and the 2001 rule change is the hinge date both terms hang on.
In use"Faced with drivers they could not contain, the coach switched to a zone defense and packed the paint."