Whereas a typical moneyline bet involves a bet on one of two options, three-way moneyline betting involves three options. When wagering on a three-way moneyline, you can bet either Team A to win, Team B to win, or for the event to end in a tie (sometimes referred to as a 'draw').
A 3-way bet is a bet on an event that has three possible outcomes: Team A wins, Team B wins, or a draw. The odds on a 3-way bet will always be higher than odds on a similar two-way bet considering there is an additional outcome. Therefore, when one places a 3-way bet there is only one way to win and two ways to lose.