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What Is American Football?

American football is a team sport played on a large grass or turf field with an oval-shaped ball. Two teams compete to score points by moving the ball into the opponent's end zone (called a touchdown) or kicking it through the goalposts (called a field goal). The goal is simple: score more points than the other team before the clock runs out. Highest score wins!

Image of a football field

Football Units

Football is played between two teams of 11 players on the field at a time. Each team has three units that rotate in and out depending on the situation. Tap each one to learn more.

Image of a football team
Offense +
The team with the ball

The offense is the unit that has possession of the ball. Their goal is to advance the ball down the field and score — either by carrying or passing the ball into the opponent’s end zone (a touchdown) or kicking it through the goalposts (a field goal).

The offense has 11 players on the field at a time and gets 4 attempts (called downs) to gain at least 10 yards. If they do, they get a fresh set of 4 downs. Key players include the quarterback (who leads the offense and handles the ball on most plays), running backs (who carry the ball on runs), and wide receivers (who catch passes).

Defense +
The team trying to stop the score

The defense is the unit without the ball. Their job is to stop the offense from advancing and scoring. They do this by tackling the ball carrier, deflecting or intercepting passes, and pressuring the quarterback into making mistakes.

Key players include defensive linemen (who rush toward the QB or plug running lanes), linebackers (who stop runs and cover short passes), and defensive backs — cornerbacks and safeties — who cover receivers and guard against big passing plays.

Special Teams +
The kicking specialists

Special teams is the third unit and comes on the field specifically for kicking situations — kickoffs (to start each half and after scores), punts (on 4th down when the offense can’t convert), field goal attempts, and extra points after touchdowns.

Special teams can swing a game through field position. A great punt or kickoff return can set up easy scoring opportunities. Key players include the kicker, the punter, and the kick returner.

The Field

The field is 100 yards long with a 10-yard end zone at each end. Yard lines are marked every 5 yards to show field position.

Image of a football field

Football Plays

Every moment of action in football is called a play. Each play starts when the center (the middle player on the offensive line) snaps — or "hikes" — the ball to the quarterback. The play ends when the ball carrier is tackled, steps out of bounds, a pass hits the ground without being caught, or a team scores. Between plays, both teams briefly huddle or line up to prepare for the next play.

Image of a football field

Downs

The most important concept in football is the down system. Think of it like four chances to move forward. The offense gets 4 attempts — called downs — to move the ball at least 10 yards. If they gain 10 yards, the count resets and they get 4 more chances. If they don’t make it in 4 downs, the other team gets the ball.

Image of chain crew

Scoring Points

There are five ways to score points in football. Each one is worth a different amount. Tap any scoring type below to learn exactly how it works!

Football scoreboard

Game Time

Games are divided into four quarters — the length of each quarter varies by age and level of play (NFL quarters are 15 minutes; youth games are often shorter). Two quarters make up a half, and the long break in the middle of the game is called halftime. Each team is given a set number of timeouts per half.

A timeout is when a coach or player stops the clock on purpose. Coaches use timeouts to talk strategy with their players, make adjustments, or simply preserve time late in a close game.

Game clock
There is also a play clock — a separate countdown timer that limits how long the offense has to start each play (usually 25–40 seconds). If they don't snap the ball in time, it's a penalty called "delay of game."

Football Actions Explained

Football has its own vocabulary of terms you’ll hear every game. This section breaks down the most common actions — what they mean and why they matter — so nothing on the field catches you off guard.

Football actions

Quick Quiz — The Game

Offense Players

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Quick Quiz — Team

Common Football Rules

Without rules, football would be complete chaos. Football rules are in place to maintain a level playing field and ensure player safety. Explore the foundation of football and see how the rules make the game we love possible.

Football rules overview

Officials

Before diving into the rules, it helps to know who enforces them. Football games are officiated by a crew of officials — commonly called referees — who each have a specific role on the field. They watch different zones and players to make sure the game is called fairly and consistently at every level, from youth leagues to the NFL.

The number of officials varies depending on league budget and age level.

Key Rules to Remember

Football has a long rulebook, but you don't need to know all of it to enjoy and understand the game. These are the most important rules — the ones that come up on nearly every drive and explain most of what you see happening on the field.

Key rules of football

What Is a Penalty?

When a player breaks a rule, a referee throws a yellow flag onto the field — that flag is your signal that something happened. The team that broke the rule is usually penalized by losing yards, meaning the ball is moved backward from where the play ended.

The other team gets to choose: accept the penalty (take the free yards) or decline it (keep the result of the play if it was better for them). The referee will announce the call out loud and demonstrate it with hand signals.

Football penalties
When you see a yellow flag fly, listen for the referee to walk to midfield and announce the call with hand signals. Don't worry — you'll quickly learn to recognize the most common ones!

Referee Hand Signals

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Holding — Referee grabs own wrist in front of their chest.
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Touchdown / Field Goal Good — Both arms raised straight up overhead.
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First Down — One arm pointing toward the defensive team's end zone.
False Start / Offsides — Both forearms rotate in circles in front of the body.
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Complete Pass — Arms are in a chin-up position.
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Incomplete Pass — Arms waved flat, side to side horizontally (like "safe" in baseball).
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Quick Quiz — Penalties

Offensive Strategy Overview

The offense's goal is to move the ball down the field and score. But it's not just raw athleticism — coaches design specific plays and players execute them based on the score, how much time is left, who's on the field, and what the opposing defense is doing. Every play call is a decision.

Pro Subscriber Content

Ready to go deeper? This section covers the strategy coaches talk about on the sideline — which players are on the field, how the blocking works, how runs are designed, and how passing routes are planned. These are the building blocks behind every play you watch.

This content is part of the Ladies Know Football Pro subscription. Subscribe to unlock the full playbook!

Play Set Up

Football plays consist of formations and concepts (passing or running).

Personnel Groupings Advanced

Before each play, the offense puts a specific group of players on the field.

Quarterback Alignment Intermediate

Where the quarterback lines up before the snap sets the tone for the entire play.

Formations Advanced

Formations in football are the way in which players line up for a particular play.

Running the Ball

When the offense hands the ball to a running back, the play is designed to attack a specific area of the defensive line. Understanding run holes and run play concepts helps you see exactly where — and why — the runner is headed.

Running back carrying the ball

Blocking Intermediate

Every run and pass play depends on the offensive line blocking defenders out of the way. There are three main blocking philosophies.


Run Holes Intermediate

Each gap in the offensive line has a number. Odd numbers run to the left; even numbers run to the right. The higher the number, the farther from center.

Diagram showing run hole numbers

Run Plays

Every run play has a name, a design, and a specific job. Knowing the play type tells you where the ball is going, who's blocking whom, and why it was called.


Run Play Categories Advanced

The hole number tells you where to run — but the play type tells you how the blockers are going to get there. Tap each type to learn more!

Gap Run +
Zone Run +
Option +

Run Play Concepts Advanced

There are a variety of ways you can run the football.

Passing the Football

A pass in football is the fundamental action where a player, typically a quarterback, throws the ball to a teammate to catch. The success of a pass and catch is called a reception.

Quarterback throwing a pass

Pass Play Types Intermediate

Routes tell receivers where to go — but the passing concept is how the quarterback delivers it.

Standard Dropback +
Play Action +
Screens +
RPO +

Routes Advanced

Every receiver runs a specific route — a pre-planned path designed to get them open against the defense.

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