Laws of association football

Association football, more commonly known as football or soccer, is a team sport played with a spherical ball between two teams of eleven players. It is played by 250 million players in over 200 countries and dependencies, making it the world's most popular sport. The game is played on a rectangular field called a pitch with a goal at each end. The object of the game is to score by moving the ball beyond the goal line into the opposing goal.

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 penalized. An offense 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.

In association football, an assistant referee (AR, known as a linesman or lineswoman from 1891 to 1996, expressions which are still in common unofficial use, and umpire before 1891) is an official empowered with assisting the referee in enforcing 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.

In association football, the referee is the person responsible for enforcing the Laws of the Game during the match. He or she is the final decision-making authority on all facts connected with play, and is the only official on the pitch with the authority to start and stop play and impose disciplinary action against players during a match. At most levels of play the referee is assisted by two assistant referees (formerly known as linesmen), who are empowered to advise the referee in certain situations such as the ball leaving play or infringements of the Laws of the Game occurring out of the view of the referee; however, the assistant referees' decisions are not binding and the referee has authority to overrule an assistant referee. At higher levels of play the referee may also be assisted by a fourth official who supervises the teams' technical areas and assists the referee with administrative tasks, and, at the very highest levels, additional assistant referees and/or video assistant referees.

John Charles Thring (11 June 1824 – 3 October 1909), known during his life as "Charles Thring" or "J. C. Thring", was an English clergyman and teacher, notable for his contributions to the early history of association football.

The video assistant referee (VAR) is a football assistant referee who reviews decisions made by the head referee with the use of video footage and a headset for communication. In 2018, VARs were written into the Laws of the Game by the International Football Association Board (IFAB) following trials in a number of major competitions.

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.

Penalty cards are used in many sports as a means of warning, reprimanding or penalising a player, coach or team official. Penalty cards are most commonly used by referees or umpires to indicate that a player has committed an offense. The official will hold the card above his or her head while looking or pointing towards the player that has committed the offence. This action makes the decision clear to all players, as well as spectators and other officials in a manner that is language-neutral. The colour or shape of the card used by the official indicates the type or seriousness of the offence and the level of punishment that is to be applied. Yellow and red cards are the most common, typically indicating, respectively, cautions and dismissals.

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 each 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 also 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. Nets are usually attached to the goal frame to catch goalscoring balls, but the ball is not required to touch the net.

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 where it went out. Corners are considered to be a reasonable goal scoring opportunity for the attacking side, though not as much as a penalty kick or a direct free kick near the edge of the penalty area.