Line or Handicap betting
Line betting is when bookmakers handicap a game. If you think one side is 5.5 points ahead of the other, you can bet that team will win by more than 5.5 pts. You can also support your opponent to lose by no more than 5.5 points or win the game.
For example, if a team was on the list as -5.5 points, your bet will win if your team wins by 6 pts or more. If a team were on the list as +5.5 points, your bet would win if your team loses by 5 pts or less or wins the game.