American football / Rule 03
Essential definitions
NFL · 2026In short
Downs, possession and loose balls.
Four chances to advance
A down starts when the ball is put into play and ends when it becomes dead. The offense normally has 4 downs to gain 10 yards and earn a new series. If the goal line is nearer than 10 yards, the target is that goal line.
Possession matters
A fumble means a player loses possession; a muff means an unsuccessful attempt to gain possession of a loose ball. A catch requires control, both feet or another body part except the hands inbounds, and a football action or enough time to perform one. Merely touching the ball is not possession.
Independent explanations and translations, not official federation publications. Independent summaries of the supplied NFL 2026 rulebook; NCAA and IFAF rules may differ. The comparison covers standard 15-a-side rugby union.
Sources & approach ↗
Sources & approach ↗