What is a yellow card?

Answer 1

In various competitive sports, such as association football and Rugby, a yellow card denotes that a player has committed some kind of foul. Depending on the sport, the caution can lead to temporary suspension from the game, or no further action until more fouls are committed.

In football (Soccer) as stated a player will receive a yellow card from the referee for a foul play. If in the same game the same foul or any other is committed by that player the referee has not option than to issue a second yellow card and immediately issue a red card. The latter means the player is sent off the field of play for the reset of the game. The player then will normally be issued with a ban from player for 3 weeks plus. Note also. Any teams own management can be issued with yellow card and red cards. These are normally for bringing the game into disrepute, swearing at the officials etc. The same sanctions apply.