Bonus codes are alphanumeric strings that players can enter on gaming or betting platforms to unlock special promotions, such as free spins, deposit matches, or exclusive offers. These codes are often used by online casinos and sportsbooks to attract new customers or reward loyal players. To redeem a bonus code, users typically need to input it during the registration process or when making a deposit. It's essential to read the terms and conditions associated with each code, as they may come with specific wagering requirements or expiration dates.