Intergovernmental organizations (IGOs) influence national policy through collaboration and regulation. They promote agreements, set standards, and facilitate dialogue among member states. By offering resources, expertise, and legitimacy, IGOs can encourage nations to adopt specific policies. For example, organizations like the United Nations and World Trade Organization create frameworks that member countries often follow, impacting domestic laws and regulations. Additionally, financial incentives and diplomatic pressure from IGOs can lead national governments to align with international expectations, significantly shaping their policy choices. Thus, IGOs play a crucial role in global governance and national policy formulation.