How many different cards are there in soccer?
Soccer has two types of cards, yellow and red. Yellow cards are
used to caution a player for a major breach of the rules, called
"misconduct". A second yellow card, as well as several egregious
forms of misconduct, warrant a red card, which indicates that the
player is sent off and can no longer play in that game or remain in
the vicinity of the pitch.
Some similar games (which do not follow the IFAB Laws of the
Game) can employ blue, green, black, white, or even so-called "soft
red" cards to mean various things, but they aren't part of the
soccer / football that most of the world plays.