The United Nations is the primary international organization responsible for promoting cooperation among nations in various areas, including economic, social, cultural, and humanitarian issues.

The World Bank's primary role is to provide financial and technical assistance to developing countries to support their economic growth and poverty reduction efforts.

The World Trade Organization (WTO) is the international organization that regulates global trade by establishing rules and procedures for the conduct of trade between nations.

The IMF's primary role is to provide financial assistance to member countries facing balance of payments problems and to promote international monetary cooperation.

The Security Council is the UN body responsible for maintaining international peace and security. It has the power to authorize military action, impose sanctions, and resolve international disputes.

The General Assembly is the main deliberative, policymaking, and representative organ of the UN. It discusses and makes recommendations on a wide range of issues, including economic growth, social development, human rights, and international peace and security.

The World Health Organization (WHO) is the international organization responsible for promoting cooperation among nations in the field of health. It works to improve the health of people around the world.

The UNDP's primary role is to provide financial and technical assistance to developing countries to support their efforts in achieving sustainable development.

The United Nations Educational, Scientific and Cultural Organization (UNESCO) is the international organization responsible for promoting cooperation among nations in the fields of education, science, culture, and communication.

UNICEF's primary role is to provide financial and technical assistance to developing countries to support their efforts in improving the lives of children and mothers.

The United Nations Environment Program (UNEP) is the international organization responsible for promoting cooperation among nations in the field of environment. It works to protect the environment and promote sustainable development.

The IAEA's primary role is to promote cooperation among nations in the field of nuclear energy, with a focus on safety, security, and non-proliferation.

The International Civil Aviation Organization (ICAO) is the international organization responsible for promoting cooperation among nations in the field of civil aviation. It works to ensure safe, secure, and efficient air travel.

The UPU's primary role is to promote cooperation among nations in the field of postal services, ensuring the efficient and reliable delivery of mail and parcels worldwide.

The International Telecommunication Union (ITU) is the international organization responsible for promoting cooperation among nations in the field of telecommunications. It works to ensure the efficient and reliable operation of telecommunication networks worldwide.