Over/Under 2.5 Goals
This market ignores who wins and focuses purely on the total goal count. 'Over 2.5' wins if the match finishes with 3 or more total goals combined (both teams added together); 'Under 2.5' wins if it finishes with 2 or fewer. The .5 exists specifically so there's never a tie — you can't score exactly 2.5 goals. You'll also see 1.5, 3.5, and other lines, but 2.5 is the standard reference point most bettors and sites use.