Online casinos allow players to gamble through the Internet as well as in the comfort of whatever place they can be in rather than traveling to wherever their favorite establishments happen to be. They may be better known as Internet casinos or virtual casinos due to this.

Much like their tangible "brick and mortar" counterparts, trusted online gambling agent casinos have ratings in the type of payback percentages and odds. Some of them even publish payout percentages on their sites, vaunting higher payback and higher frequency than their competitors.

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

Because of its very nature of being virtual and intangible, online casinos have trust problems with prospective and even regular clients.