How FIFA's Goal Line Technology Actually Works

FIFA, world soccer's governing body, is using goal-line technology for the first time in international competition during the Confederations Cup tournament currently taking place through end of the month in Brazil

The move, allowing officials to review did-he-or-didn't-he shots on goal, comes to the relief of many soccer fans after a growing number of media and critics called for its implementation at the international level. Goal line technology will be used again at next summer's World Cup, also in Brazil

But just because it's finally here doesn't mean most futbol aficionados understand how goal line technology actually works