Association football, more commonly known as football or soccer, is a team sport played between two teams of 11 players each, who primarily use their feet to propel a ball around a rectangular field called a pitch. The objective of the game is to score more goals than the opposing team by moving the ball beyond the goal line into a rectangular-framed goal defended by the opposing team. Traditionally, the game has been played over two 45-minute halves, for a total match time of 90 minutes. With an estimated 250 million players active in over 200 countries and territories, it is the world's most popular sport.
The penalty area or 18-yard box is an area of an association football pitch. It is rectangular and extends 18 yd (16 m) to each side of the goal and 18 yd (16 m) in front of it. If any part of the ball is over any part of a line demarking the penalty area then the ball is considered to be inside the penalty area.
Offside is one of the laws in association football, codified in Law 11 of the Laws of the Game. The law states that a player is in an offside position if any of their body parts, except the hands and arms, are in the opponents' half of the pitch, and closer to the opponents' goal line than both the ball and the second-last opponent.
Futsal is a football-based game played on a hardcourt like a basketball court, smaller than a football pitch, and mainly indoors. It has similarities to five-a-side football and indoor football.
A penalty kick is a method of restarting play in association football, in which a player is allowed to take a single shot at the goal while it is defended only by the opposing team's goalkeeper. It is awarded when an offence punishable by a direct free kick is committed by a player in their own penalty area. The shot is taken from the penalty spot, which is 11 m from the goal line and centred between the touch lines.
In association football, the referee is the person responsible for interpreting and enforcing the Laws of the Game during a match. The referee is the final decision-making authority on all facts connected with play, and is the match official with the authority to start and stop play and impose disciplinary action against players and coaches during a match.
The Laws of the Game are the codified rules of association football. The laws mention the number of players a team should have, the game length, the size of the field and ball, the type and nature of fouls that referees may penalise, the offside law, and many other laws that define the sport. During a match, it is the task of the referee to interpret and enforce the Laws of the Game.
In rugby football, the penalty is the main disciplinary sanction available to the referee to penalise players who commit deliberate infringements. The team who did not commit the infringement are given possession of the ball and may either kick it towards touch, attempt a place kick at goal, or tap the ball with their foot and run it. It is also sometimes used as shorthand for penalty goal.
A corner kick is the method of restarting play in a game of association football when the ball goes out of play over the goal line, without a goal being scored and having last been touched by a member of the defending team. The kick is taken from the corner of the field of play nearest to the place where the ball crossed the goal line.
A football pitch is the playing surface for the game of association football. Its dimensions and markings are defined by Law 1 of the Laws of the Game, "The Field of Play". The pitch is typically made of natural turf or artificial turf, although amateur and recreational teams often play on dirt fields. Artificial surfaces are allowed only to be green in colour.
A goal kick is a method of restarting the play in a game of association football. Its procedure is dictated by Law 16 of the Laws of the Game.
A dropped-ball is a method of restarting play in a game of association football. It is used when play has been stopped due to reasons other than normal gameplay, fouls, or misconduct. The situations requiring a dropped-ball restart are outlined in Law 8 and Law 9 of the Laws of the Game; Law 8 also contains the dropped-ball procedure.
A kick-off is the method of starting and, in some cases, restarting play in a game of association football. The rules concerning the kick-off are part of Law 8 of the Laws of the Game.
In the sport of association football, fouls and misconduct are acts committed by players which are deemed by the referee to be unfair and are subsequently penalised. An offence may be a foul, misconduct or both depending on the nature of the offence and the circumstances in which it occurs. Fouls and misconduct are addressed in Law 12 of the Laws of the Game. A foul is an unfair act by a player, deemed by the referee to contravene the game's laws, that interferes with the active play of the game. Fouls are punished by the award of a free kick to the opposing team. A list of specific offences that can be fouls are detailed in Law 12 of the Laws of the Game ; these mostly concern unnecessarily aggressive physical play and the offence of handling the ball. An infringement is classified as a foul when it meets all the following conditions:
- It is committed by a player ;
- It occurs on the field of play;
- It occurs while the ball is in play;
- It is committed against an opponent.
The ball in and out of play is the ninth law of the Laws of the Game of association football, and describes to the two basic states of play in the game.
In association football, an assistant referee is an official who assists the referee in administering the Laws of the Game during a match. Although assistants are not required under the Laws, at most organised levels of football the match officiating crew consists of the referee and at least two assistant referees. The responsibilities of the various assistant referees are listed in Law 6, "The Other Match Officials". In the current Laws the term "assistant referee" technically refers only to the two officials who generally patrol the touchlines, with the wider range of assistants to the referee given other titles.
Association football was first codified in 1863 in England, although games that involved the kicking of a ball were evident considerably earlier. A large number of football-related terms have since emerged to describe various aspects of the sport and its culture.
Comparison of association football (football/soccer) and rugby union (rugby/rugger) is possible because of the games' similarities and shared origins.
In games of association football, teams compete to score the most goals during the match. A goal is scored when the ball passes completely over a goal line at either end of the field of play between two centrally positioned upright goal posts 24 feet (7.32 m) apart and underneath a horizontal crossbar at a height of 8 feet (2.44 m) — this frame is itself referred to as a goal. Each team aims to score at one end of the pitch, while preventing their opponents from scoring at the other end. Nets are usually attached to the goal frame to catch goalscoring balls, but the ball is not required to touch the net.
A free kick is a method of restarting play in association football. It is awarded after an infringement of the laws by the opposing team.
