The house edge is the advantage of the casino displayed in a percentage. For example, with roulette there is one zero on which the house always wins. This means the house edge is 2,70%. The house edge on slots is displayed as the RTP (return to player). If the rtp of a slot is 97% for example, the house edge is 3%.
There are however many variables that can decrease or increase the house edge. Bonuses, for instance, are not taken into the equation.
