Online casino deposit bonus codes are promotional offers that provide players with extra funds or free spins when they make a deposit. These codes are typically entered during the registration or deposit process, unlocking various bonuses that enhance the gaming experience. By using these codes, players can maximize their bankroll, allowing for more chances to win. It's essential to read the terms and conditions associated with each bonus code, as wagering requirements and expiration dates may apply. Overall, deposit bonus codes are a great way to boost your online casino play.