Online casinos allow players to gamble over the Internet and in the comfort of what ever place they can be in rather than traveling to wherever their favorite establishments are located. They can be often known as Internet casinos or url virtual casinos due to this.

Much like their tangible "brick and mortar" counterparts, online casinos have ratings in the form of payback percentages and odds. A lot of them even publish payout percentages on their own sites, vaunting higher payback and better frequency than their competitors.

Payback percentage is defined as "is the overall percentage that a machine will return to the player within the long haul." This parameter is often programmed into what ever game the virtual casino may be running and is set based on the owner's specifications.