If you're taking the points with the underdog, the points will be added to your team's final score to determine the winning outcome of your bet.
The favorite will have negative points while the underdog will have positive points. A point spread is a number created by oddsmakers to determine the gap between the favorite and the underdog of a game, as teams and players are not all equal in skill. A point spread bet is a wager on which team/player will win the match/game according to a point spread.