Goal line technology to debut at Club World Cup

The video tutorial explains the use of goal line technology in football, focusing on two systems: Hawkeye and Goal Ref. Hawkeye uses high-speed cameras to create a virtual image of the goal line, while Goal Ref employs a magnetic field and a special ball to detect goals. Both systems aim to assist referees in making accurate decisions during matches.

In what situations might match officials rely on Goal Line technology?

What happens when the ball completely crosses the goal line according to the technology?