Bet

A bet is a wager in which participants commit money or something of value on the outcome of an uncertain event, with the promise that the winner will receive the stake or an agreed payout if the event occurs. Bets are typically settled after the event.

Common forms include sports bets on teams or players, casino-style bets on games of chance, prop bets on specific outcomes (for example, who scores first), and financial or futures bets on market movements. Bets can be placed with bookmakers, betting exchanges, or informal networks.

Odds express the likelihood of outcomes and determine the potential payout. Formats include decimal, fractional, and American (moneyline) odds. The overall risk is the amount staked versus the potential return; the house or bookmaker often sets the odds to secure a margin.

The expected value of a bet depends on the true probability of the outcome and the offered odds. If the expected value is positive for a bettor, the bet is favorable in theory; if negative, it is unfavorable over many trials.

Gambling law varies by jurisdiction. Some places restrict or prohibit certain bets or require licenses for bookmakers. Online betting has expanded globally but faces cross-border regulatory issues and consumer protection concerns.

History shows wagering on uncertain outcomes dates back to antiquity, with formal bookmaking emerging in Europe in the 18th–19th centuries and online betting rising in the late 20th and early 21st centuries.

Responsible gambling emphasizes approaching bets with caution; problem gambling resources exist, and many jurisdictions impose age limits and self-exclusion provisions to mitigate harm.