A promo code in 1xBet is a special code that can be used during registration to activate a welcome bonus for new players. The promo code varies depending on the country and the time of registration. For example, the current promo code for October 2023 is "CASHMAX", "1VIPCODE", "SUPERBOOST", and "NEWBONUS". The promo code activates a welcome bonus, which can be a percentage match on the initial deposit or a free accumulator bet on football consisting of three events or more. To use the promo code, players need to enter it in the designated field during registration. It is important to note that the terms and conditions of the welcome bonus may vary depending on the country and the time of registration, so players should read them carefully before using the promo code.