A deposit bonus bet is a promotional offer provided by online betting platforms to attract new customers or retain existing ones. When users make their initial deposit, the platform matches a percentage of that amount, giving them extra funds to wager. This bonus enhances the betting experience, allowing players to explore various games or sports without risking their own money. However, it's essential to read the terms and conditions, as these bonuses often come with wagering requirements that must be met before any winnings can be withdrawn.