First deposit bonus codes are promotional offers provided by online casinos and sportsbooks to attract new players. When users sign up and make their initial deposit, they can enter a specific bonus code to unlock additional funds or free bets. These bonuses enhance the gaming experience by allowing players to explore various games or betting options with extra capital. It's essential to read the terms and conditions associated with these codes, as they often come with wagering requirements and expiration dates. Overall, first deposit bonus codes serve as an enticing incentive for newcomers to join and engage with the platform.