There is no one definitive answer to this question. In general, the house (the casino) always has the advantage.
However, there are a few things that can give a player a slight edge.
First, it’s important to understand how blackjack is played. The dealer starts with two cards face up and players may choose to either stand (take no action) or hit (put one or more cards into the discard pile, hoping to obtain a higher total than the dealer). If the player hits, the dealer must replace one of the original cards with another from her hand and add it to the deck.
If the player stands, nothing happens. The game continues until one player either has more than 21 points (a hand worth at least $10), or all players have folded.
Players can improve their odds of winning by playing conservatively – ie., not putting in too many high-risk bets – and by studying casino blackjack rules and strategy.
Casinos generally frown upon players who refuse to play according to house rules, so be sure to familiarize yourself with these guidelines before you start playing so that you don’t get caught up in any disputes.
In general, however, it’s important to remember that casinos have an inherent advantage when it comes to blackjack and most players will lose money over time if they try to bet on every hand. Instead, focus on playing conservatively and using basic strategy – and you should have a good chance of winning most games.