Offside is one of the most discussed rules in football. The idea behind it is simple: it prevents attackers from simply waiting near the opponent’s goal for a long pass.

The basic idea

A player is in an offside position if, when a teammate plays the ball to them, any scoring part of the body is nearer to the opponent’s goal line than both the ball and the second-last opponent. The goalkeeper usually counts as one of the opponents.

Being in an offside position is not an offence

  • You are not penalised if you are level with the second-last defender.
  • You are not offside in your own half.
  • You are not offside from a goal kick, a throw-in or a corner kick.

When it becomes an offence

A player in an offside position is penalised only if they become involved in active play, such as by playing the ball, interfering with an opponent or gaining an advantage. Referees and assistants decide, often supported by video review in major competitions.

Why it matters

The rule shapes tactics. Defenders move forward together to catch attackers offside, while attackers time their runs carefully.

Takeaway

Think of offside as a rule about position at the moment the pass is played. For exact wording, consult the current Laws of the Game.