Zonal marking focuses on shape: each defender holds a zone and engages whichever attacker enters it. The team’s collective structure matters more than individual match-ups.
It is the default for modern defensive blocks and most set-piece schemes. It keeps shape when the opponent makes runs designed to drag man-markers around.
Zonal systems fail when players are late to react or the zones overlap poorly. Smart attackers exploit the seams between zones with late, angled runs.