Offside (association football)
Offside is one of the laws in association football, codified in Law 11 of the Laws of the Game. The law states that a player is in an offside position if any of their body parts, except the hands and arms, are in the opponents' half of the pitch, and closer to the opponents' goal line than both the ball and the second-last opponent.
A linesman signals for offside by raising his flag.
An assistant referee signals that the offside offence was in the middle of the pitch; on the far side the flag would be pointed up at 45 degrees and near the assistant referee it would be pointed down at 45 degrees.
J. C. Thring
Association football, commonly known as football, or soccer, is a team sport played between two teams of 11 players each, who primarily use their feet to propel a ball around a rectangular field called a pitch. The objective of the game is to score more goals than the opposing team by moving the ball beyond the goal line into a rectangular-framed goal defended by the opposing team. Traditionally, the game has been played over two 45-minute halves, for a total match time of 90 minutes. With an estimated 250 million players active in over 200 countries and territories, it is the world's most popular sport.
The attacking player (No. 10) attempts to kick the ball into the net behind the opposing team's goalkeeper (here wearing red and yellow) to score a goal.
An early draft of the original hand-written 'Laws of the Game' drawn up on behalf of The Football Association by Ebenezer Cobb Morley in 1863 on display at the National Football Museum, Manchester, England
The Aston Villa team in 1897, after winning both the FA Cup and the English Football League
The Zamalek team in 1921, after winning the Sultan Hussein Cup, the first title in Egyptian football history, 1921
