A qualifying bet is a bet you place at a bookmaker for something in return, such as a free bet or bonus. For example, a bookmaker might offer you a 10 free bet if you first bet 10 of your own money.
Some promotions, such as Sign Up offers and Profit Boosts, are given to all sportsbook users without the need to qualify. But many promotions require an initial bet to qualify for the promotion. This is known as a Qualifying Bet. The Qualifying Bet reward is given in the form of Site Credit or Free Bets.