The "Foul Line" is a crucial marking in various sports, particularly in basketball and bowling. In basketball, it is a line that players must stay behind when taking free throws. If a player steps over this line before the ball is released, the shot is considered a foul, and the attempt is disqualified. In bowling, the foul line separates the approach area from the lane. Bowlers must release the ball before crossing this line; if they step over it, the roll does not count, and no score is awarded for that throw. This rule helps maintain fairness and consistency in the game.