The flag is up! We explain what that means and why one of soccer's most important rules is also one of the toughest to see live.

Understanding soccer's offside rule hinges on timing — it's about a player's position when the ball is passed, not received.

The Women’s World Cup is back again, which means one of the most controversial calls in sports has also returned. The offside rule has caused some of the most frustrating moments ever in soccer and is the bane of some fans' existence. Offside is often ...

Offside is one of soccer’s most confusing rules, but the basic idea is simple once you know what referees are looking for.