Online casino is a derivation of the land-based traditional casino, also referred to as virtual casinos or gambling sites and providing diverse games or a single one depending on the site operation, franchise, etc. The internet casino offers generally better odds than land-based casinos for games such as slot machines where the probability of winning are regulated through the house, the so-called house advantage.

On August 18, 1995 the world's first online casino debuted, Internet Casinos, Inc. (ICI) operating with 18 different casino games and for the first time offering also online access to the nation's Indian trusted lottery dealer. Conversely, since the early days ICI operates out of the Turks and Caicos Islands, outside the usa to avoid government prosecution.