WHAT IS A SPREAD?
When you bet the point spread, you are betting on the margin in victory. Just like moneylines, a minus sign (-) means that team is the favorite. A plus sign (+) means that the team is the underdog. For example, you are betting on a basketball game. One team is -5 and the other is +5. The team that is -5 is the favorite. This means that either team must win by at least 5 points in order to cover the spread. The team that is +5 is more valuable because they are the underdog.
WHAT IS THE OVER/UNDER?
The over/under is based on the total number of points, runs, goals, etc. For example, you are betting on a baseball game and the O/U is 9. You can either bet over 9 total runs or under 9 total runs. If you bet the over, both teams have to combine for over 9 runs. If you bet the under, both teams have to combine for under 9 runs.