An online casino first deposit bonus is a promotional offer designed to attract new players by rewarding them for their initial deposit. Typically, this bonus matches a percentage of the deposit amount, providing extra funds or free spins to enhance the gaming experience. For example, a 100% bonus on a $100 deposit gives players an additional $100 to play with. These bonuses often come with specific wagering requirements, meaning players must bet a certain amount before withdrawing any winnings. Overall, first deposit bonuses are a great way to kickstart your online gaming journey.