The betting Favorite is considered the better team and listed with a Minus (-) sign while the Underdog is listed with a Plus (+) sign. The point spread is a number aka the “betting line” set by bookmakers at the sportsbook which is intended to even the playing field between two teams and give a reason for bettors to bet on either side of the game. One of the most popular types of sports betting is betting against the spread also known as ATS. Related Topics In Our Sports Betting Guide: