In blackjack what is the difference in what the dealer's 1 card showes compared to the players ?

The question isn't very explanitory, but the dealer has one card showing a face card (I guess your 1 card), compared to the player who, in most blackjack games, don't show their card until the end. Some Casino games play all cards face up for the players, though. If the dealer has an ace or 10 face card, then it indicated the possibility of a 20 or 21, but a lower card could mean the dealer has more chance of busting.