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A formation in American football refers to the position players line up in before the start of a down. There are both offensive and defensive formations and there are many formations in both categories.
At the highest level of play in the NFL and NCAA, the one constant in all formations is the offensive line, consisting of the left and right tackle, left and right guard, and a center. These five positions are often referred to collectively as the "line", and have the primary role of blocking. By rule there must be two additional players on the line of scrimmage called Ends. These players are eligible receivers and may play near the linemen (tight ends) or farther away (split end or wide receiver). Most teams play additional players near (but still off) the line of scrimmage to act as extra pass receivers.
Offensive positions 
Up to four players can be behind the line of scrimmage, but one is always designated the quarterback (defined as the player who receives the ball from the center). Upon the snap of the ball, the quarterback becomes the ball carrier. The ball carrier has five options:
- He may keep the ball and run with it.
- He may hand or pitch the ball sideways or backwards (also called a lateral) to another player, who then becomes the new ball carrier. Multiple pitches are permitted on a single play, as long as all of them go backwards.
- He may throw a forward pass to an eligible receiver, who then becomes the new ball carrier. Only 1 forward pass is permitted per play, and the pass must occur behind the original line of scrimmage. A forward pass is distinct from a pitch, and any number of pitches are permitted before or after a forward pass.
- He may hold the ball for a place-kicker who attempts a field goal.
- He may kick the ball himself, either by punting the ball to the other team, or by attempting a drop-kicked field goal (which is rare).
The three other backs can be halfbacks, (who primarily carry the ball), fullbacks, (who primarily block), or they can play near (but not on) the line of scrimmage to act as extra tight ends or wide receivers. A tight end that fills the role as the 4th back is often called an "H-Back" and a wide receiver that fills that role is sometimes known as a "flanker" or a "slot" receiver (depending on where he lines up). Most formations have a "strong" side (the side with the tight end, or the side with more players) and a "weak side" (the side opposite the tight end, or the side with fewer players).
Descriptions and diagrams to display offensive formations typically use the following symbols:
- QB = quarterback (the player who leads and informs the offense the plays)
- C = center (the player who begins the play with a snap on the line and blocks afterwards)
- G = guard (the player who blocks on line beside the center)
- T = tackle (the player who blocks on the line beside the guard)
- TE = tight end (the player who often goes out for passes and often blocks on the line)
- WR = wide receiver (the player who gets assigned a route and has to catch the ball when passed to)
- HB = halfback (the primary ball carrier)
- FB = fullback (the secondary ball carrier also used for blocking)
The offense is required to set up a formation before a play, subject to several rules:
- The formation must have at least 7 players on the line of scrimmage. The 7 players are not required to be next to each other, so they may spread out across the width of the field, but this is rare; most offenses place at least 5 players together in a continuous line. Teams may place more than 7 players on the line, but only the 2 players at each end of the line may be eligible receivers, so generally this only occurs with the special formations used in kicking and punting situations.
- The other players not on the line (usually 4 in number) may be positioned anywhere, but all must be at least 1 yard behind the 7 or more players on the line of scrimmage. The traditional saying is "7 on the line, 4 in the backfield" but this is something of a misnomer, as "backfield" usually refers to the area directly behind the offensive line. 3 of the 4 "backfield" players (i.e., the 3 not receiving the snap from center) may line up as wide receivers as long as they are behind the line of scrimmage; these are known as slot receivers if between the ends, and flankers if outside the ends.
- Of the 7 (or more) players on the line of scrimmage, all except those at either end of the line are ineligible receivers: these players may not touch or catch a forward pass (unless it is first touched by an eligible receiver, including a deflection by a defensive player), and on a forward pass play, they may not advance downfield (i.e., across the neutral zone) before the pass crosses the neutral zone. Ineligible receivers may advance freely on a running play or after a pass is thrown. These players typically have uniform numbers in the range 50-79 to indicate they are ineligible.
- In the NFL, players with numbers 50-79 are considered ineligible by default. They must report to the referee if they line up in a position which would normally be considered eligible; failure to do so will result in a penalty to the offense. The referee will relay that information to the defensive captain, and he will generally announce it to spectators as well. After reporting as eligible, those players may line up at any legal position just as if they were normally eligible receivers. Offenses sometimes use this tactic in a short yardage situation to provide extra blocking, and some plays are even designed for a designated player to receive a pass.
- In high school (NFHS) numbers 50-79 are always ineligible, and may not receive. In fact if one of these players touch a forward pass before it is touched by a defensive player, it is a penalty for offensive pass interference (15 yards plus loss of down). The numbers can only be eligible during a scrimmage kick (punt or field goal).
- The offense must set before the play: all players must take their positions and remain motionless for at least 1 second before the ball is snapped. Typically, after the offense breaks the huddle and walks to the line, the quarterback will call "set" and then begin his regular snap count. The offense is allowed to shift in certain situations and reorganize, but they must again set once they assume new positions. Once set, offensive players may not move until the snap and may not flinch to simulate a snap (with the exception of the man in motion, described below). A violation is a false start penalty.
- The offense may put one of the 4 backfield players in motion after the set but before the snap. The motion must be either parallel to or (if in the backfield) away from the line of scrimmage at the snap; certain types of football such as arena football allow forward motion at the snap. In Canadian football, all of the players in the backfield can be in motion, in any direction, at the time of the snap, as long as they have not crossed the line of scrimmage before the snap.
Two terms often heard in referring to defensive formations are box and secondary. The box is defined as an area on the defensive side of the ball, within 5 yards of the line of scrimmage and framed by the offensive tackles. This area is most commonly occupied by defensive linemen and linebackers. The secondary can refer to the defensive backs as a group, or to the area behind the linebackers usually occupied by defensive backs. The two standard NFL defenses, the 4-3 and the 3-4, have 7 players in the box. The phrase "8 in the box" is used to indicate that 1 of the 2 safeties has moved into the box to defend against the run.
Defensive positions 
The three basic defensive positions are:
- Defensive lineman (DL): Linemen play at the line of scrimmage, directly across from the offensive line. They are categorized as defensive tackles (DT) or defensive ends (DE). The 4-3 defense has 2 tackles and 2 ends; the 3-4 defense has 2 ends and 1 tackle, who is sometimes called a nose tackle (NT) to indicate the 3-4. Tackles line up inside and rely on power to stop the run, while ends line up outside and are faster and more athletic to allow them to pursue the quarterback.
- Linebacker (LB): Linebackers are positioned 2 to 4 yards behind the defensive line. The 4-3 defense has 3 linebackers, who are categorized as strong, middle and weak (SLB, MLB, WLB; also called Sam, Mike and Will). This is not an indication of strength; it instead refers to the positioning of the linebackers relative to the offense. Strong linebackers line up on the same side as the tight end, weakside away from the tight end. A 3-4 defense will use 4 linebackers, who are indicated by their side (right/left) and positioning (inside/outside).
- Defensive back (DB): Defensive backs can include cornerbacks (CB), a strong safety (SS, lines up on same side as tight end) and a free safety (FS, so called because they are "free" to roam where needed). Cornerbacks are almost always responsible for defending against the pass, and particularly against wide receivers; often they are the fastest defensive players. Safeties also defend against the pass, matching up on tight ends and backs, but they are positioned in the center of the field to be prepared to stop the run as well.
Rules regarding defensive formations are not as complex as their offensive counterparts. The defense may line up anywhere on its side of the neutral zone, and players are free to move at any time before the snap, but all defensive players must remain on their side of the neutral zone (defined as the width of the ball) before the snap. If they line up on the wrong side of the line, the offending player(s) are offsides.
This formation assumes the offense is lined up strong side right (from the offense's point of view). This diagram could be matched up to an offensive formation diagram to make a complete 22 player football field.
See also 
|Positions in American football and Canadian football|
|Linemen||Guard, Tackle, Center||Linemen||Tackle, End, Nose tackle||Kicking players||Placekicker, Punter, Kickoff specialist|
|Quarterback||Linebackers||Snapping||Long snapper, Holder|
|Backs||Halfback (Tailback), Fullback, H-back||Backs||Cornerback, Safety, Halfback||Returning||Punt returner, Kick returner|
|Receivers||Wide receiver, Tight end, Slotback||Nickelback, Dimeback||Tackling||Gunner|
|Formations (List) — Nomenclature|