The term "house edge" is known well to most casino gamblers. The house edge is, in other words, the advantage that a casino has over its players and is measured in percentages. For example, in a game with a house edge of 5% the casino will retain 5% of all money that is bet on that game. If $100,000 is bet on the game over the course of a night the casino will hold on to $5,000.
In roulette the house edge can be up to 5.26%, in craps it can be over 16% and in Keno the house edge can be as high as 29%. However, blackjack is known as a game with a relatively low house edge because a player's knowledge of basic strategy can lower the edge dramatically. With a few blackjack tips and tricks up your sleeve, the house edge in a game of blackjack can be lower than 1%.
In blackjack, the dealer has an advantage because one of his cards is not exposed and players must make decisions based on intuition and faith if they don't have knowledge of basic blackjack strategy. However, the house continues to rake in money with blackjack because the truth of the matter is that most players simply don't have a grasp of the basic blackjack strategies like learning blackjack odds and counting cards and many don't even know more advanced strategies like splitting and doubling down. The good news is that while the casinos keep winning money off these more oblivious players, you can beat the odds by learning basic strategy and lowering the house edge.