Common variations of blackjack in online casinos include European Blackjack, Atlantic City Blackjack, and Vegas Strip Blackjack, each with distinct rules that add variety to gameplay. European Blackjack usually restricts the dealer from taking a hole card until players finish their hands, slightly increasing the house edge. Atlantic City Blackjack allows players to split up to three times and includes a late surrender option. In Vegas Strip Blackjack, players can split any two 10-value cards and double down after a split.