A 100 First Deposit Bonus is an enticing promotional offer provided by online casinos and betting platforms to attract new players. When users make their initial deposit, they receive a bonus equal to 100% of that amount, effectively doubling their bankroll. This bonus allows players to explore a wider range of games and increase their chances of winning. However, it's essential to read the terms and conditions, as wagering requirements and withdrawal limits may apply. Overall, this bonus serves as a great incentive for newcomers to dive into the gaming experience.