For example, if the odds for a particular team to win a championship are +500, this means that a bettor would receive a payout of $500 for every $100 they wagered if that team goes on to win the championship.
Plus odds show how much you will win from a bet of $100 e.g +500 means you win $500. Minus odds show how much you need to bet to win $100 e.g -500 means you have to bet $500 to win $100.