Goal-line technology is a system used in football to determine whether the ball has fully crossed the goal line. It uses cameras or sensors placed around the goal area to track the ball's exact position. When the ball crosses the line, the system sends a signal to the referee, allowing decisions to be made quickly and accurately. This technology helps ensure fairness by removing doubts in situations where it is unclear if a goal has been scored. It is designed to work without interrupting the flow of the game.

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