Wild cards in poker are a reference made to cards that can have a variable value as fixed by the casino or the dealer. If the king is declared as a wild card, a player can take whatever value is required for the making of the hand to be the value for the wild card. In short wild cards in poker are like a joker.  Wild cards can be used to represent any card suit or rank in poker.  This is very useful in creating a very strong hand.

Wildcards in poker can make the strategy more complex and paradoxical. The introduction of wild cards in poker allows a particular card to be used for any value that a player requires to form a hand.  Suppose King is declared as wild card, the player can use it like a joker for any suit, any rank card that he would need to make a hand.