In any football tournament like the World Cup, yellow or red cards are shown by the referee when fouls are committed by players during matches.
But recently, for the first time in the history of football, a female referee showed a white card during a club match in Portugal.
Red and yellow cards have been used since the 1970s to be issued by referees for dangerous or undesirable behaviour.
But a white card was used for the first time in a women’s club match in Portugal.
The match was played on 21 January and when the first half was about to end, a man sitting in the dugout fell ill.
At this point, the medical staff of both teams rushed towards the sick man and the referee waved a white card to appreciate his sportsmanship.
The purpose of this white card is to appreciate the fair play of the teams during a match to improve the ethical values of football.
The card was first introduced in Portugal along with several other FIFA initiatives.
FIFA has also introduced concussion substitutes and longer stoppage time during matches.