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Lead
In American football, the specific role that a player takes on the field is referred to as their "position." Under the modern rules of American football, both teams are allowed 11 players on the field at one time and have "unlimited free substitutions," meaning that they may change any number of players at any point in the game as long as the substitution occurs before or after a play. This has resulted in the development of three task-specific "platoons" of players within any single team: the offense (the team with possession of the ball, which is trying to score), the defense (the team trying to prevent the other team from scoring, and to take the ball from them), and the so-called 'special team' (who play in all kicking situations). Within these three separate "platoons", various positions exist depending on the main task of each player.

Offense
In American football, the "offense" is the term used to describe the team that has possession of the ball and is advancing toward the opponent's end zone to score points. The eleven players of the offense can be separated into two main groups: the five offensive linemen, whose primary job is to block opponents and protect their quarterback, and the six skill position players, whose primary job is to move the ball down the field by either running with it or passing it.

The organization of the offense is strictly mandated by the rules of the sport: there must be at least seven players on the line of scrimmage and no more than four players (known collectively as "backs") behind it. The only players eligible to handle the ball during a normal play are the backs and the two players on the end of the line. These players are also known as "eligible receivers" or "eligible ball carriers." The remaining players (known as "interior linemen") are "ineligible" to catch forward passes. Within these strictures, however, creative coaches have developed a wide array of offensive formations to take advantage of different player skills and game situations.

The following positions are standard in nearly every game, though different teams will use different arrangements of them, dependent on their individual game plans.

Running back (HB/FB)

 * Running backs are players who line up behind the offensive line in a position to receive a hand-off from the quarterback and execute a rushing play. Anywhere from one to three running backs may be utilized on a play (or none, which is referred to as an "empty backfield"). Depending on where they line up and what role they have, running backs come in several varieties. The "tailback," also known as the "halfback," is often a team's primary ball carrier on rushing plays. They may also catch passes, often acting as a "check-down" or "safety valve" when all other receivers on a pass play are covered. The "fullback" is often larger and stronger than the tailback and acts primarily as a blocker, though the fullback may also be used for catching passes or for rushing as a tailback does. Fullbacks often line up closer to the line of scrimmage than tailbacks in order to block for them on rushing plays. A "wing-back" or a "slot-back" is a term for a running back who lines up behind the line of scrimmage outside the tackle or tight end on either side of the offensive line. Slot-backs are usually only found in certain offensive alignments, such as the flexbone formation. There also exists a similar position, known as the "H-back", that is actually considered a modification of the normal tight end position.

Special teams
Special teams are units that are on the field during kicking plays. While many players who appear on offensive or defensive squads also play similar roles on special teams (offensive linemen to block, or defensive players to tackle) there are some specialist roles which are unique to the kicking game.

Kicking specialists
Kicking specialists are in charge of kicking the football. Depending on the type of specialist and the play that was called, the responsibilities of the these positions vary.

Kicker (K)

 * Also called a "placekicker", they handle kickoffs, extra points, and field goals. All three situations require the kicker to kick the ball off the ground, either from the hands of a holder or off of a tee. Some teams employ two kickers: one kicks extra points and field goals, and the other, known as a "kickoff specialist", handles kickoffs. Most, however, use a single kicker for both jobs, and rarely, the same player may also punt.

Punter (P)

 * The punter usually lines up 15 yards behind the line of scrimmage (this distance has to be shortened when it would result in being on or behind the end line). The punter, upon receiving the snap, drops the ball and kicks it from the air. This is usually done only on fourth down and is done to relinquish possession to the defensive team as far downfield as possible.

Kickoff specialist (KOS)

 * Kickoff specialists are exclusively used during kickoffs. Teams employ kickoff specialists if they feel neither their kicker nor punter is good enough at kicking off. Due to their specialized nature and the limited number of active roster spots, professional KOSs are rare.

Kick returner (KR) and punt returner (PR)

 * Returners are responsible for catching kicked balls (either on kickoffs or punts) and running the ball back. These are usually among the fastest players on a team and typically play either wide receiver or cornerback, as well. However, due to the relatively high likelihood of injury during kick returns, most professional teams will not regularly use their very best WRs or CBs as returners. Teams may also use the same player for both return positions or have a specific returner for punts and another for kickoffs.

Jammer

 * Jammers try to slow down gunners during punts or kickoffs so that the returners have more time.