A 1st Deposit Bonus is a promotional offer provided by online casinos and betting sites to attract new players. When a user makes their initial deposit, the platform matches a percentage of that amount, often up to a specified limit. This bonus allows players to explore games and increase their chances of winning without risking too much of their own money. Typically, terms and conditions apply, including wagering requirements that dictate how many times the bonus must be played through before withdrawal. It's a great way to enhance the gaming experience right from the start.