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Betting on team sports is an important service industry in many countries. For example, football pools are played by millions of Britons every week.

In Canada and the United States sports betting is usually illegal (Nevada offers full sports betting and the Canadian provinces offer government-run sports parlay betting). However, millions engage in it despite its illegality.

In Canada and the United States the most popular sports bets are made:

against the spread; that is, the bettor wagers either that the favoured team will win by a specified number of points or that it will not. Betting the favourite is called giving the points and betting the underdog taking the points. See point spread.

against odds; the most popular types of bets against odds are simple bets that a team will win and over-under bets, which are bets on the total points, runs, or goals scored by both teams. In making an over-under bet, the bettor wagers that the total will be higher or lower than a total specified by the bookmaker.

against a combination of odds and spread

In sports betting a parlay is a bet that two or more teams will all win. In the United States one of the most common forms of sports betting is the parlay card, on which bettors wager on the outcomes of two or more games. If all their picks win, they collect. Most such betting occurs in workplaces.