There are a large number of on-line casinos, in which people can play casino games such as Roulette, Blackjack, Craps, and many other people. These games are played against the "house", which tends to make money due to the fact that the odds are slightly in its favour. Some unscrupulous sites have been proven to provide rigged games, which are less mathematically fair than they seem.
There are a large number of on-line poker rooms which offer various games of Poker, most generally Texas hold 'em, but also Omaha, Seven-card stud, and other game types. Players play against each other, with the "house" making its money through the "rake".
On-line sports betting
A number of significant bookmakers offer fixed-odds gambling over the internet, with gamblers usually betting on the results of sporting events. A relatively new internet innovation is the bet exchange, which allows people to place bets with every other (with the "house" taking a small commission).
Typically, gamblers upload funds to the on-line gambling company, make bets or play the games that it offers, and then cash out any winnings. European gamblers can frequently fund gambling accounts by credit card or debit card, and cash out winnings directly back to the card.