An Apostolic Constitution is a formal document issued by the Pope, which serves as a significant source of Church law and doctrine within the Roman Catholic Church. It addresses important matters of faith, governance, or discipline and is considered one of the highest forms of papal teaching. These documents can establish new laws, clarify existing ones, or provide guidance on various issues. Apostolic Constitutions are part of the broader category of papal documents, which also includes Apostolic Exhortations and Encyclicals, each serving different purposes in the Church's mission and governance.