Betting odds represent the probability of a particular outcome occurring in a sporting event or other wager. They are typically expressed in three formats: fractional, decimal, and moneyline. Fractional odds show the potential profit relative to the stake, while decimal odds indicate the total return on a winning bet, including the stake. Moneyline odds reflect the amount one would need to bet to win a certain amount or the profit on a $100 bet. Understanding these odds is crucial for bettors to assess risk and potential returns effectively.