When a team or contestant is so heavily favored by the public that the odds for the event are less than even, the team or contestant is known as the odds on favorite.
For example, if the Pittsburgh Steelers are incredibly favored to beat the Arizona Cardinals, the odds may be 5:9. This means a person wanting to place a bet on the favorite must put down $9, but they will only win $5 if the team wins. These types of favorites do occur regularly and are usually avoided by all professional gamblers and most casual players. Sometimes fans will place bets on their favorite team no matter the odds. Sportsbooks make a bit more money when there is an odds on favorite because of the fees typically attached to placing a bet. The juice bookmakers bring in is also more significant than in a straight wager.