A yellow card is a warning for a foul committed. It can also given for being verbally abusive towards the referee or other players. It is also given for delaying a game, such as when a Goalie takes too long to take a goal kick.
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For doing a foul or a tackle or attack another player (but sometimes the referee doesn't see it e.g. in the FA cup final when Stoke did a million horrible tackles on Manchester City but the referee was in his own world). It's actually quite rare to get a red card, but 2 yellow cards mean a red card.
It means that you are kicked off the field and your team must play the rest of the game with 1 less player then the other team.
they get ejected from the game, the team has to play a man down, and the player with a red card cant play in the next game.