This is the most common type of bet in sports. A critical research review. Views Read Edit View history.gambling soccer online NAUCITE GRCKI ONLINE Sports betting is the activity of predicting sports results and placing a wager on the outcome. The spread, or line, is a number assigned by the bookmakers which handicaps one team and favors another when two teams play each other and Bookmaking · Legality · Positions of American · Famous betting scandals. The key concept to understand when betting on these particular sports is that they mostly use moneylines rather than point spreads and involve simply picking. In moneyline betting, the bookie assumes most people are going to wager on the favorite and sets the line on the underdog so as to cover any.