Constitutional treaties are formal agreements that establish the foundational legal framework for a state or organization. They outline the principles, structures, and processes of governance, often serving as the supreme law. An example is the Treaty on European Union, which defines the functioning of the European Union. These treaties typically require ratification by member states, ensuring that all parties agree to the terms. They can be amended or replaced through subsequent treaties, reflecting changes in political, social, or economic contexts. The process of creating and modifying constitutional treaties is crucial for maintaining stability and legitimacy in governance.