A betting pool, sports lottery, sweep or office pool if one at work, is a form of gambling, specifically a variant of parimutuel betting influenced by lotteries, where gamblers pay a fixed price into a pool (from which taxes and a house "take" or "vig" are removed), and then make a selection on some outcome, usually related to sport. The pool is evenly divided between those that have made the correct selection. There are no odds involved; each winner's payoff depends simply on the number of gamblers and the number of winners. In an informal game, the vig is usually quite small or non-existent. (True parimutuel betting, which was historically referred to as pool betting, involves both odds calculations and variable wager amounts.)