Virtual roulette refers to online roulette. It is played on your computer in a virtual casino. Just because the dealer, ball and table are not real does not mean that the money is not. This is a full blown gambling game brought to your home or office by the innovations of the internet.
Imagine that someone took every aspect of the game of roulette and made a computer game out of it. They incorporated the ball, wheel, betting options, payouts, odds and everything else (minus the cocktail waitress). Then, they put it on the internet and were able to offer full on betting from anywhere in the US. You would have Virtual Roulette.
The internet has made games like virtual roulette exist and overwhelmingly popular. This is the exact game that you play in Vegas but from your own computer. When you win, you win real money (and visa versa mind you). Gambling has never been so easy or convenient. Plus, if you don't know exactly all the rules or strategies, the website will be able to give you some pointers.
Legal Virtual Roulette
As long as the website is sanctioned, the gambling is legal. This means that you can play from any state in the US. As long as you are 18 years of age or older and have some money to spend, you will be able to play some roulette. But, just remember, it is for keeps. The money will be real.