A defense where players guard areas of the floor rather than specific opponents, forcing the offense to beat a shape instead of individual defenders.
Watch the gaps between defenders as the ball moves. Zone lives and dies by those seams. The offensive player who catches in a gap between two defenders has half a second before both close. The best zone offenses move the ball faster than the defense can shift, finding the seam before it shuts.
Zone is rare in the EuroLeague, and it shows up mostly as a change-up, a look a coach throws at an offense that has spent a half solving man-to-man. The surprise is half the value. A team that has not prepared for it has to solve a shape on the fly, and the seams between defenders are where it either finds a clean look or throws the ball away.
In a zone defense, each player guards an area of the floor rather than a specific opponent. The defenders shift together as the ball moves, protecting space instead of chasing men.
In man-to-man, each defender is responsible for one player anywhere he goes. In a zone, each defender is responsible for a region and picks up whoever enters it. Zones protect the paint and hide weaker defenders; man-to-man pressures the ball more directly.
A 2-3 zone puts two defenders up top and three across the baseline. It walls off the paint and dares opponents to beat it from outside, which is why teams with cold shooters struggle against it and good shooting teams pick it apart.