Football

Football is a team sport played between two teams of eleven players each. It is a ball game played on a rectangular grass field with a goal at each end. The objective of the game is to score by maneuvering the ball into the opposing goal. Other than the goalkeepers, players may not intentionally use their hands or arms to propel the ball in general play. The winner is the team which has scored most goals at the end of the match.

The sport is also known by other names in some parts of the English-speaking world, usually association football and its contraction, soccer. These names are often used to distinguish the game from other codes of football, since the word "football" may be used to refer to several quite different games.

Football is played at a professional level all over the world, and millions of people regularly go to football stadia to follow their favourite team, whilst billions more avidly watch the game on television. A very large number of people also play football at an amateur level.

According to a survey conducted by Fédération Internationale de Football Association (FIFA), football's governing body, published in the spring of 2001, over 240 million people regularly play football in more than 200 countries in every part of the world. Its simple rules and minimal equipment requirements have no doubt aided its spread and growth in popularity. In many parts of the world football evokes great passions and plays an important role in the life of individual fans, local communities, and even nations; it is therefore often claimed to be the most popular sport in the world.

Nature of the game

Two teams of eleven players each compete to get a round ball (itself known as a football) into the other team's goal, thereby scoring a goal. The team which has scored the most goals at the conclusion of the game is the winner; if both teams have an equal number of goals then the game is a draw. The primary rule for this objective is that players, other than the goalkeepers, may not intentionally touch the ball with their hands or arms during play (though they do use their hands during a throw-in restart). Although players mainly use their feet to move the ball around, they may use any part of their bodies other than their hands or arms.
 
A goalkeeper dives to stop the ball from entering his goal.In typical game play, players attempt to move towards a goal through individual control of the ball, such as by dribbling (running with the ball close to their feet); by passing the ball from team-mate to team-mate; and by taking shots at the goal. Opposition players may try to regain control of the ball by intercepting a pass or through tackling the opponent who controls the ball.

Football is generally a free-flowing game with the ball in play at all times except when the ball has left the field of play by wholly crossing over a boundary line (either on the ground or in the air), or play has been stopped by the referee. When play has been stopped, it recommences with a specified restart.

The game is played in accordance with a set of rules known as the Laws of the Game, which are summarised below.

Players and Equipment

Each team consists of a maximum of eleven players (excluding substitutes), one of whom must be the goalkeeper. Competition rules may state a minimum of seven players are required to constitute a team. There are a variety of positions in which the outfield players are strategically placed by a manager/coach, though these positions are not defined or required by the Laws.

One player on each team must be designated as that team's goalkeeper. The goalkeeper is the only player allowed to handle the ball with his hands or arms, but is restricted to doing so within the penalty area (also known as the "box" or "18 yard box") in front of his own goal.

The basic equipment players are required to wear includes a shirt (or jersey), shorts, socks (or stockings), footwear and adequate shin guards. Players are forbidden to wear or use anything that is dangerous to themselves or another player (including jewellery or watches).

A number of players may be replaced by substitutes during the course of the game. The maximum substitutions permitted in international games and in national level leagues are three, though substitution numbers may be varied in other leagues. The usual reasons for a player's replacement include injury, tiredness, ineffectiveness, a tactical switch, or to waste a little time at the end of a finely poised game. In standard adult matches, a player who has been substituted may not take further part in the match.

Officials

A game is presided over by a referee, who has "full authority to enforce the Laws of the Game in connection with the match to which he has been appointed" (Law 5), and whose decisions regarding facts connected with play are final. The referee is assisted by two assistant referees (formerly called linesmen). In many high-level games there is also a fourth official, who assists the referee and may replace another official should the need arise.

Playing field
 
The length of the field (pitch) for international adult matches should be in the range 90-120m (100-130 yards) and the width should be in the range 45-90m (50-100 yards).The pitch must be rectangular, with the length of the touch line longer than the width of the goal line.

The longer boundary lines are touch lines, while the shorter boundaries (on which the goals are placed) are goal lines. On the goal line at each end of the field is a goal. The inner edges of the goal posts must be 7.32m (8 yards) apart, and the lower edge of the crossbar must be 2.44m (8 feet) above the ground. Nets are usually placed behind the goal, though are not required by the Laws.

In front of each goal is an area of the field known as the penalty area (colloquially "penalty box", "18 yard box" or simply "the box"). This area consists of the area formed by the goal-line, two lines starting on the goal-line 16.5m (18 yards) from the goalposts and extending 18 yards into the pitch from the goal-line, and a line joining these. This area has a number of important functions, the most prominent being to denote where the goalkeeper may handle the ball and where a foul by a defender which would usually punished by a direct free kick becomes punishable by a penalty kick.