Microgaming, Playtech and Cryptologic are the most top suppliers of online gaming software. Almost always offered as free downloads, their software is used by the greater part of well respected online Casinos. The software uses complex mathematical algorithms created by Random Number Gernerators (RNGs) to create a completely arbitrary result for games such as poker, Roulette, BlackJack, slots, and craps. Thus, the roll of the dice behaves just as it would have you rolled actual dice in a physical Casino.