A treaty is a formal agreement between two or more countries that outlines their rights and responsibilities. Treaties can cover various topics, such as trade, peace, and environmental protection. They are usually negotiated by diplomats and require ratification by the governments involved to become legally binding. Once ratified, treaties serve as a framework for international relations and cooperation. They can help resolve conflicts, establish alliances, and promote stability. Examples of important treaties include the Treaty of Versailles, which ended World War I, and the Paris Agreement, aimed at addressing climate change.