The greater the discrepancy, the greater the advantage the casino holds over the player is. For every kind of payout in roulette, they are always a fraction shorter than the actual probability of each bet-type winning, allowing for the house edge. All common casino games favour the house to some degree, and roulette is no different. The term house edge refers to the probability of a bet winning compared to the payout odds offered, and in effect, the amount the player loses relative for any bet made, on average.
