A Sign Up Deposit Bonus is a promotional offer provided by online casinos and betting platforms to attract new players. When users create an account and make their first deposit, they receive a bonus, often a percentage of the deposit amount, which can be used to play games or place bets. This incentive not only enhances the gaming experience but also increases the potential for winnings. However, it's essential to read the terms and conditions, as these bonuses typically come with wagering requirements and other restrictions.