Betting has always been a popular money-winning opportunity. It is based on a bettor’s prognosis of a result of a future event. Betting involves wagering on an event; this act is considered to be a confirmation of a bettor’s belief in the estimated result. The common betting pot is shared among winners. The amount of winnings depends on the odds (expected probabilities) which are calculated beforehand.

Betting administrators are called bookmakers. Various bookmaking offices are specialized on different betting categories: sports and games, political and social life etc.

At present, there appeared a great number of sports betting sites that give opportunities to wager on sports events. These web resources are similar in structure and are collectively named sports casinos. Any modern sports betting casino consists of several bookmarks each dedicated to a separate kind of sport. A great number of sports and games may be subjected for betting with the most popular of them being: football, baseball, basketball, horse and car races. Sports betting odds are updated by web administration with the regard on certain factors including: ranks of the teams/players in a pair; their current championship positions; teams’/players’ readiness for contest which may influence the result (transfers, traumas, disqualifications and other factors).

There are several ways to make a bet: to pay directly from a banking account, to make online transfer, to purchase a scratch card etc. Scratch cards contain digital passwords needed to be typed in special windows in order to place a bet (e.g. football scratch cards, lotto scratch cards and others).