A deposit bonus is a promotional offer provided by online casinos or betting sites, where players receive extra funds or free bets when they make a deposit. Typically, this bonus is a percentage of the deposited amount, encouraging users to increase their initial investment. For example, a 100% deposit bonus means that if a player deposits $100, they receive an additional $100 in bonus funds. These bonuses often come with specific wagering requirements, meaning players must bet a certain amount before they can withdraw any winnings derived from the bonus.