Bonus deposit offers are promotional incentives provided by online casinos and betting platforms to attract new players and retain existing ones. These offers typically match a percentage of a player's initial deposit, giving them extra funds to play with. For example, a 100% bonus on a $100 deposit means the player receives an additional $100 in bonus money. While these offers enhance the gaming experience, players should carefully read the terms and conditions, as they often come with wagering requirements and restrictions on eligible games.