The purpose of black jack is to beat the bank. You have to try to get as close to 21 as possible. Going over means you lose. If you have end up with less then 22 points in your hand, but with more than the bank, you win the hand. Jack's, queen's, and king's are worth 10 points. The cards 2 to 10 are worth face value. The ace is either worth 1 or 11 points. If you end up with more than 21 points in your hand, the bank wins.