The main organs of the UN are the General Assembly, the Security Council, the Economic and Social Council, the Trusteeship Council, the International Court of Justice, and the UN Secretariat. All were estabished when the UN was founded.
The General Assembly is the main deliberative, policymaking and representative organ of the UN. All 193 Member States of the UN are represented in the General Assembly. Decisions on important questions, such as those on peace and security, admission of new members and budgetary matters, require a two-thirds majority of the General Assembly. Decisions on other questions are by simple majority. The General Assembly, each year, elects a GA President.
The Security Council has primary responsibility, for the maintenance of international peace and security. It has 15 Members (5 permanent and 10 non-permanent members). Each Member has one vote. All Member States are obligated to comply with Council decisions. The Security Council has a Presidency, which rotates, and changes, every month.
Economic and Social Council:
The Economic and Social Council is the principal body for coordination, policy review, policy dialogue and recommendations on economic, social and environmental issues. It serves as the central mechanism for activities of the UN system. It has 54 Members, elected by the General Assembly. It is the United Nations’ central platform for reflection, debate, and innovative thinking on sustainable development.
The Trusteeship Council was established in 1945 by the UN Charter, to provide international supervision for 11 Trust Territories that had been placed under the administration of seven Member States, and ensure that adequate steps were taken to prepare the Territories for self-government and independence.
International Court of Justice:
The International Court of Justice is the principal judicial organ of the United Nations. Its seat is at The Netherlands.The Court’s role is to settle legal disputes and to give advisory opinions on legal questions.
The Secretariat is composed of the Secretary-General and tens of thousands of international UN staff members who carry out the day-to-day work of the UN as mandated by the General Assembly. UN staff members are accepted into the armed forces internationally and locally, and work in duty stations and on peacekeeping missions all around the world.