An over/under (totals) bet is a bet on whether the total number of points, goals, runs, or another statistic in an event will be over or under a specific number.
For example, if the total is set at 2.5 goals:
Over 2.5 - 3 or more goals must be scored.
Under 2.5 - 0, 1, or 2 goals must be scored.
The total and the applicable statistic are shown in the betting market.