The roulette wheel is basically a rotating vessel with slanted walls that allows a marble to roll down into separate pockets on its rim. The pockets contain a complex arrangement of characteristics and numbers and are designed to defeat all strategy by being as random as possible. The pockets are colored alternately red and black. Depending on whether or not you are playing with an American or European wheel there may be two or one green colored pockets that are designated with the number 0. Most online casinos in the boast roulette wheels with a single wheel while American online casinos tend to have roulette wheels with a double zero.

In a real casino the randomness of the number is dependent on spinning wheel. When you play roulette in a free online casino the numbers are generated by a piece of software called a random number generator. This random number generator is also designed so that it corresponds to the established Roulette odds. This software produces thousands of random numbers until you point and click to stop the wheel from spinning or until the virtual croupier declares that the wheel has stopped spinning and calls out the wining number.

While surfing online to find an online casino you will find that some sites offer the American roulette wheel and others offer the European roulette wheel used in casinos. The main difference is that the American wheel has two zero pockets, one marked 0 and one marked 00.