Playing Blackjack classic is simple, as you are dealt two cards and try to get as near as you can to 21 without going over. You are playing against the dealer in this version.
In blackjack perfect pairs you can make various other types of wagers. This is covering if the cards you were given happen to be a pair.
Progressive blackjack is geared towards players with higher stakes. For each wager made the jackpot gets bigger and this version is only available online.
Blackjack pontoon is a variation, which has 2-8 players one of which is the banker. The game on the Internet deals with buying instead of doubling.
Blackjack switch lets you exchange the 2nd card in two hands dealt to you. It is played with eight card decks and has a chart especially for the game.
In the variation of play 21 blackjack is much like classic blackjack, but you can double down at any time. The dealer will lose having less than 20 or 20 if there are at least six cards.