The objective is simple to state and hard to execute: move the ball into the opponent end zone more often than they move it into yours. Possession is governed by the down system. The offense has four attempts, called downs, to advance the ball at least ten yards. Succeed, and it earns a fresh set of four downs, a first down. Fail, and possession turns over to the defense at the spot of the ball. Because handing the opponent good field position is costly, teams almost always punt on fourth down unless they are close to the marker or already in scoring range.
A game is sixty minutes of play divided into four fifteen-minute quarters, but the clock stops frequently, on incomplete passes, out-of-bounds plays, and scores, so a broadcast runs roughly three hours. Play begins with a kickoff and proceeds snap by snap from the line of scrimmage, the imaginary line where the ball is spotted. Each play starts when the center snaps the ball to the quarterback. The team with more points when time expires wins; a tie sends the game to overtime. Officiating is handled by a seven-person crew, with instant replay available to review scoring plays, turnovers, and other reviewable calls.
Scoring at a glance
Core rules
Line of scrimmage and the snap
Every play begins from the line of scrimmage, an imaginary line running the width of the field through the spot of the ball. The offense must line up at least seven players on that line, and the play starts when the center snaps the ball backward between the legs, usually to the quarterback. Until the snap, no offensive player except one man in motion may move. The defense lines up on its own side of a neutral zone the length of the ball, and neither team may cross into it before the snap without drawing a penalty.
The down-and-distance system
The offense is given four downs to advance the ball ten yards from where the series began. The situation is described as down and distance, for example first-and-10 or third-and-2. Gaining the ten yards resets the count to first down and awards a new set of four. Fail on all four, and the defense takes over at the dead-ball spot, called a turnover on downs. This single mechanic drives nearly all strategy: teams weigh running to grind out short yardage against passing to gain chunks, and the chains, a physical ten-yard measuring device, settle close calls.
The passing game
On each play the offense may throw one forward pass, and only from behind the line of scrimmage. Eligible receivers, chiefly wide receivers, tight ends, and running backs, may catch it; interior linemen generally may not. A completion counts once a receiver controls the ball and gets both feet, or another body part, down inbounds. If the pass hits the ground first it is incomplete, the clock stops, and the down is used with no gain. A defender who catches a forward pass records an interception and immediately becomes a ball carrier, a live turnover that can be returned for yards or a score.
The running game
Instead of passing, the quarterback may hand or pitch the ball to a running back, or keep it himself, to attack the line of scrimmage on the ground. Blockers on the offensive line and at tight end try to open running lanes by driving defenders off their spots. A ball carrier stays live until he is tackled, meaning his knee or elbow touches the ground while in the grasp of a defender, or he steps out of bounds. Because rushing keeps the clock moving and rarely risks a turnover, teams lean on it to protect leads and control tempo late in games.
Scoring plays and conversions
Carrying or catching the ball across the goal line into the end zone scores a touchdown, worth six points, the game highest single-play reward. After a touchdown the scoring team attempts a conversion: a kicked extra point through the uprights for one point, snapped from the 15-yard line, or a two-point conversion by running or passing into the end zone from the two. A field goal, kicked through the uprights on any down, is worth three and is the usual choice on fourth down within range. A safety, worth two points, is awarded to the defense when it tackles a ball carrier in his own end zone.
Change of possession
Possession changes hands in several ways. A punt, a kick on fourth down, concedes the ball but pushes the opponent back. A turnover on downs gives the defense the ball at the spot after a failed fourth down. Turnovers can also be sudden: an interception on a pass, or a fumble, when a ball carrier loses control of the ball before he is down and either team recovers it. Recovered fumbles and interceptions are live and may be advanced. After any score, the scoring team kicks off to the opponent, formally transferring possession to restart play.
The clock and timeouts
The game clock runs during play but stops on incompletions, plays ending out of bounds, scores, penalties, and the two-minute warning near the end of each half. A separate play clock, forty seconds after most plays, forces the offense to snap the ball promptly or be penalized for delay of game. Each team receives three timeouts per half to stop the clock or regroup. Clock management becomes decisive late in halves: a trailing team hurries and throws to the sideline to save time, while a leading team runs the ball and stays inbounds to bleed the clock toward zero.
Kickoffs and returns
Each half, and every score, is followed by a kickoff that puts the ball back in play. The kicking team boots the ball downfield, and a returner may catch it and run, or signal a fair catch or take a touchback to start at a fixed yard line. A kickoff, unlike a scrimmage down, is a free-kick situation with its own alignment and rules. Because collisions on kick returns produced a high rate of injuries, the NFL has repeatedly redesigned the play, most dramatically with the dynamic kickoff format adopted for the 2024 season to reduce high-speed impacts while preserving returns.
Fouls & penalties
Holding
Holding is the most common penalty in football. Offensive holding, ten yards, is called when a blocker grabs, hooks, or restricts a defender outside the frame of the body rather than blocking with open hands. Defensive holding, five yards and an automatic first down, punishes a defender who grabs or restrains a receiver more than five yards downfield. Because so many blocks technically involve grabbing, officials use judgment about whether the hold materially affected the play, which makes holding one of the most debated calls in the game.
Pass interference
Pass interference protects the right of both a receiver and a defender to make a play on a catchable forward pass. Defensive pass interference, which can carry a huge penalty by placing the ball at the spot of the foul, is called when a defender impedes a receiver through early contact, arm-barring, or playing the body rather than the ball. Offensive pass interference, ten yards, punishes a receiver who pushes off or blocks a defender before the ball arrives. The spot-foul nature of a long defensive interference call can swing field position by fifty yards on a single play.
Roughing and personal fouls
Player-safety fouls carry fifteen yards and often an automatic first down. Roughing the passer protects a quarterback after he throws, banning hits to the head, drives into the ground, and low blows to the knees. Roughing the kicker protects punters and place-kickers. Unnecessary roughness covers late hits, blows to a defenseless player, and helmet-first contact, while a targeting-style hit to the head can bring an ejection. These rules, expanded steadily since the 2010s, reflect the league response to research on brain injury and are among its most consequential in-game protections.
Pre-snap fouls
Several penalties police the moments before the snap. A false start, five yards, is called when an offensive player moves abruptly after setting, drawing the defense offside. Offside and encroachment penalize a defender who crosses the neutral zone before the snap. Illegal formation and illegal motion flag an offense that fails to line up correctly or has a man moving toward the line at the snap. Delay of game, five yards, follows when the offense lets the play clock expire before snapping. These fouls are self-inflicted and, because they are avoidable, are treated as marks of poor discipline.
Facemask and horse-collar
Two tackling fouls target dangerous techniques. The facemask penalty, fifteen yards, punishes any player who grabs and twists or pulls the facemask or helmet opening of an opponent, a hold that can wrench the neck. The horse-collar rule, also fifteen yards, bans tackling a ball carrier by grabbing the inside collar of the shoulder pads or jersey and yanking him down, a maneuver that caused several serious leg injuries before it was outlawed in 2005. Both fouls reflect the league ongoing effort to remove specific, injury-prone actions without eliminating the tackle itself.
Match format
The NFL season runs from September to February. Its eighteen-week regular season gives each of the thirty-two teams seventeen games and one bye week, for a league total of 272 games. Teams are split into two conferences, the AFC and NFC, each with four divisions of four. A game is four fifteen-minute quarters with a halftime break; the two teams switch ends of the field each quarter. If the score is level after sixty minutes, the game proceeds to overtime, a ten-minute period in the regular season in which, under rules adopted for 2025, both teams are guaranteed at least one possession. A regular-season game can still end in a tie.
Standings determine the postseason. Seven teams from each conference reach the playoffs: four division winners and three wild cards, seeded one through seven, with the top seed earning a bye. The playoffs are single elimination, running through the wild-card, divisional, and conference-championship rounds. The two conference champions meet at a neutral site in the Super Bowl, the league championship game, played on the second Sunday of February and decided in as many overtime periods as it takes, since a postseason game cannot end in a tie. The winner lifts the Vince Lombardi Trophy.
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