A 50 Deposit Bonus is a promotional offer commonly used by online casinos and betting sites to attract new players. When a user makes their first deposit, the site matches 50% of the amount, providing extra funds to play with. For example, if a player deposits $100, they receive an additional $50 in bonus money. This incentive allows players to explore more games and increase their chances of winning, but it's essential to read the terms and conditions, as wagering requirements may apply before withdrawing any winnings.