Blackjack is both the game in which you aim to hold a hand adding up to 21, and the name given to a 2-card hand of a Picture card and an Ace.
To play Blackjack, you get 2 cards and can ask for additional cards until you are close to or hit a value of 21. If you go over, you lose. If the dealer gets higher, you lose
A perfect Blackjack hand consists of a Picture (Jack, Queen or King) card and an Ace.
Yes. If you get Blackjack on your first two cards, you automatically win.