Black Jack is a card game played against the dealer (Computer). Players aim to get a hand close to 21 without going over. Cards 2-10 are face value, face cards are 10, and Aces can be 1 or 11. Players can Hit or Stand, trying to beat the dealer without busting. Going over 21 results in a loss. Black Jack is an Ace and a card worth 10, which is a winner combination over other 21.