No-deposit bonus codes are promotional offers provided by online casinos and gaming platforms that allow players to receive bonus funds or free spins without having to make an initial deposit. These codes are typically entered during the registration process or in the cashier section of the site. They serve as an enticing way for new players to explore games and potentially win real money while minimizing financial risk. However, it's essential to read the terms and conditions, as these bonuses often come with wagering requirements and restrictions on eligible games.