A foot fault is a violation in racquet sports, such as tennis, where a player steps over or outside the baseline while serving. This happens when the player's foot touches or crosses the line before the ball is hit. In tennis, the server must keep both feet behind the baseline until the ball is served. If the player steps over the line during the serve, it results in a foot fault, which counts as a fault in the game. If a player commits two foot faults in a row, they lose the point. This rule helps ensure fairness and proper positioning during the serve.

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