What is the Two yellow cards rule in football?

Answer 1

A first yellow card is shown by the referee to the player guilty of an infringement. If the same player warrants a second yellow card later on in the game, the referee will show the second yellow card, and will then immediately show a red card and send the player off the pitch.

Answer 2

The yellow card is a warning to a player who did something illegal in the game.

Answer 3

According to the FIFA Laws of the Game, a player who receives a second caution (yellow card) in the same match must be shown the red card and sent off.