In professional football, a transfer is the action taken whenever a player under contract moves between professional clubs. It refers to the transferring of a player's registration from one professional association football club to another. In general, the players can only be transferred during a transfer window and according to the rules set by a governing body. Usually some sort of compensation is paid for the player's rights. When a player moves from one club to another, his old contract is terminated and he negotiates a new one with the club he is moving to, unlike in American, Canadian and Australian sports, where teams essentially trade existing player contracts.

The concept of a football transfer first came into existence in England after the Football Association (FA) introduced player registration sometime after 1885.

Before that, a player could agree to play one or more games for any football club. After the FA recognized professionalism in 1885, it sought to control professional players by introducing a player registration system. Players had to register with a club each season, even if he remained with the same club from the season before. A player was not allowed to play until he was registered for that season. Once a player was registered with a club, he was not allowed to be registered with or play for another club during the same season without the permission of the FA and the club that held his registration. The players however, were free to join another club before the start of each season, even if their former club wished to retain them.

Transfer may refer to:

Association football, more commonly known as football or soccer, is a sport played between two teams of eleven players with a spherical ball. At the turn of the 21st century, the game was played by over 250 million players in over 200 countries, making it the world's most popular sport. The game is played on a rectangular field of grass or green artificial turf, with a goal in the middle of each of the short ends. The object of the game is to score by driving the ball into the opposing goal.

In general play, the goalkeepers are the only players allowed to touch the ball with their hands or arms (unless the ball is carried out of play, where the field players are required to re-start by a throw-in of the game ball), while the field players typically use their feet to kick the ball into position, occasionally using their torso or head to intercept a ball in midair. The team that scores the most goals by the end of the match wins. If the score is tied at the end of the game, either a draw is declared or the game goes into extra time and/or a penalty shootout, depending on the format of the competition. The Laws of the Game were originally codified in England by the Football Association in 1863 and have evolved since then. Association football is governed internationally by FIFA - Fédération Internationale de Football Association (English: International Federation of Association Football), which organises the FIFA World Cup every four years.

Association may refer too:

Voluntary associations, groups of individuals who voluntarily enter into an agreement to accomplish a purpose

Associations in various fields of study:

Names of particular entities or things:

Football refers to a number of sports that involve, to varying degrees, kicking a ball with the foot to score a goal. The most popular of these sports worldwide is association football, more commonly known as just "football" or "soccer". Unqualified, the word football applies to whichever form of football is the most popular in the regional context in which the word appears, including association football, as well as American football, Australian rules football, Canadian football, Gaelic football, rugby league, rugby union and other related games. These variations of football are known as football "codes".

Various forms of "football" can be identified in history, often as popular peasant games. Contemporary codes of football can be traced back to the codification of these games at English public schools in the eighteenth and nineteenth century. The influence and power of the British Empire allowed these rules of football to spread, including to areas of British influence outside of the directly controlled Empire, though by the end of the nineteenth century, distinct regional codes were already developing: Gaelic Football, for example, deliberately incorporated the rules of local traditional football games in order to maintain their heritage. In 1888, The Football League was founded in England, becoming the first of many professional football competitions. In the twentieth century, the various codes of football have become amongst the most popular team sports in the world.