The object is to have a hand with a total value higher than the dealer's without going over 21. Kings, Queens, Jacks and Tens are worth a value of 10. An Ace has the value of 1 or 11. The remaining cards are counted at face value.
All cards are at face value, except for the King, Queen and Jack which count as 10. An Ace will have a value of 11 unless that would give a player or the dealer a score in excess of 21; in which case, it has a value of 1.