In a moneyline bet, the favorite is the team or competitor expected to win, indicated by negative odds, which reflect a lower potential payout in relation to the stake because the likelihood of winning is considered higher. Conversely, the underdog is the team or competitor expected to lose, represented by positive odds, which offer a higher potential payout since the likelihood of winning is deemed lower. This distinction highlights the perceived strength of each participant in the match, with favorites generally seen as more likely to succeed, while underdogs present a riskier but potentially more rewarding betting opportunity.