Betting means something of value on the outcome of a game or event. Commonly associated with gambling are horse racing, boxing, numerous playing-card and dice games, cockfighting, jai alai, recreational billiards and darts, bingo, and lottery. In most gambling games it is customary to express the idea of probability in terms of "odds against winning." In the U.S. casino gambling, once highly restricted, is now legal in many states, and lotteries are employed by many states to raise revenues. The Internet has also become a venue for placing bets. See also bookmaking; casino.

Sports betting is the general activity of predicting sports results by making a wager on the outcome of a sporting event. Perhaps more so than other forms of gambling, the legality and general acceptance of sports betting varies from nation to nation

The Internet provides the perfect medium for online sports betting offering scope for effective presentation of real time betting lines in conjunction with all the sports news and research of the world wide web at the punter's fingertips. It's no wonder almost every sport betting organization worth its salt has an online offering. Not all are good though.

sports betting is commonly done through a bookmaker. The bookmaker earns a commission or "vigorish" by regarding the money at risk as less than the size of the bet placed. A common line is a $110 bet on a fair coin which pays $210 to win and $0 to lose.On this line, it costs $220 to bet both sides of the same coin simultaneously, but the combined bet always pays $210.Bookmakers generally offer two types of wagers on the winner of a sporting event: a straight-up or money line bet, or a point spread wager. Moneylines and straight-up prices are used to set odds on sports such as association football, baseball and hockey (the scoring nature of which renders point spreads impractical) as well as individual vs. individual matches, like boxing.Another common wager available for sporting events involves predicting the combined total score between the competing teams in a game. Such wagers are known as "totals" or "over/unders". Many bookmakers offer several alternative bets, including the following:

• Proposition bets.
• Parlays.
• Teasers.
• Run line, puck line or goal line bets.
• Future wagers.
• Head-to-Head.
• Totalizators.