On 22 January, the Treaty on the Prohibition of Nuclear Weapons (TPNW) will enter into force as binding, international law for its first 50 states parties. The entry into force of the Treaty will be a milestone in the global community’s efforts to eliminate nuclear weapons. The TPNW codifies the norms and actions that are needed to create and maintain a world without nuclear weapons. The impact of the Treaty will be built gradually and will depend on how its provisions are accepted and applied by each and every state. At the First Meeting of States Parties to the TPNW, which will take place in Austria within a year after entry into force, the states parties will start taking important decisions that will shape the long-term implementation, institutionalisation, and universalisation of the Treaty.