An online casino deposit bonus is a promotional offer that rewards players for making a deposit into their gaming account. Typically, this bonus comes in the form of a percentage match on the initial deposit, allowing players to enjoy extra funds or free spins to enhance their gaming experience. These bonuses are designed to attract new players and retain existing ones, providing an opportunity to explore a wider range of games. However, it's essential to read the terms and conditions, as wagering requirements and restrictions may apply before cashing out any winnings.