Free bets or bonuses are constantly offered by online sports betting sites to all bettors as either an incentive or a reward for something that the bettor has done on the site. The most common form of free bets and bonuses are sign up bonuses that are offered to a bettor the first time that they sign up to the online betting sites. The most popular and most enjoyed online betting sites will offer these bonuses and incentives to their gamblers on an ongoing basis and almost always will provide them with these bonuses over and over again.