Written by Megan Taylor, sports reporter covering international sports since 2020
The offside rule in soccer has again become a major World Cup talking point, with new and casual fans questioning how the law works, why it exists and why video reviews can make decisions feel so tight.
The rule often draws extra attention during the FIFA World Cup because millions of viewers are watching games they may not follow every week. It matters because offside shapes how teams attack, defend and time runs behind the back line.
For more World Cup football coverage, read Socceroos World Cup Push Prompts Jason Geria Call For Fans And Football Funding, while the official law can be found through the International Football Association Board Laws of the Game.
How The Offside Rule Works
A player is offside if any playable part of their body is beyond the second-last opponent when a teammate plays the ball toward them.
Hands and arms do not count, because they cannot legally be used to play the ball. Broadcast freeze frames are used to judge the exact moment the pass is made, which is why some calls are decided by very small margins.
If an offside offence is called, the defending team receives an indirect free kick from the position of the offence.
Why The Rule Exists
Offside stops attackers from waiting near goal all game and forces teams to build moves with timing, spacing and structure.
Without it, defenders could be dragged deep for long periods, the pitch would stretch unnaturally, and many of football’s best attacking patterns would disappear. The rule also rewards defenders who hold an organised line and attackers who time their runs correctly.
There are key exceptions. A player cannot be offside from a throw-in, a corner kick or when receiving the ball in their own half.
That is why the rule remains central to football, even when World Cup reviews frustrate supporters. It keeps the game balanced, tactical and built around movement rather than goal-hanging.