A wagering challenge is a type of promotion that awards a free bet for wagering a certain amount. Some wagering challenges require you to wager a certain total amount, others require a bet of a minimum value to be placed. The stake will only count for the wagering challenge after the bet settles normally, and if the wagering challenge has been completed, the free bet will be credited within 24 hours of the respective bet or bets being settled.
Important: Wagering challenges can have specific requirements such as minimum odds or they may only apply for certain bets or matches. Always check the terms of the offer in the Promotions tab or in your account under My promotions before placing your bet!
For further information on how to use free bets in general, please refer to this article.