The United Nations is an intergovernmental organisation founded in 1945 to maintain international peace, promote cooperation among countries, and tackle shared global problems. It works through six principal organs established by its founding treaty, the UN Charter, supported by a wider system of specialised agencies, funds, and programmes. Today the organisation brings together 193 member states, making it the most broadly representative body in world affairs.
Why was the UN created?
The United Nations was established in 1945, in the aftermath of the Second World War, when representatives of 50 countries met to draft the UN Charter. The Charter set out the organisation’s core purposes: to maintain international peace and security, to develop friendly relations among nations, to achieve cooperation in solving economic, social, cultural, and humanitarian problems, and to promote respect for human rights. It replaced the earlier League of Nations, which had failed to prevent global conflict.
Membership is open to peace-loving states that accept the Charter’s obligations, and it has grown steadily through decolonisation and the emergence of new nations, rising from the original 51 members to 193 today. Each member agrees, in principle, to settle disputes peacefully and to support the organisation’s decisions, though enforcement ultimately depends on the political will of states.
The Charter itself functions as the organisation’s founding treaty and, in effect, its constitution. It sets out the purposes and principles of the UN, defines the powers of each organ, and establishes core commitments such as the sovereign equality of members and the general prohibition on the use of force except in self-defence or when authorised by the Security Council. Amending the Charter is deliberately difficult, requiring broad agreement including the consent of the permanent members of the Security Council.
What are the six principal organs?
The Charter divides the UN’s work among six principal organs, each with a distinct function. The table below summarises them.
| Organ | Main role | Notable feature |
|---|---|---|
| General Assembly | Main deliberative and policymaking body | All 193 members, one vote each |
| Security Council | Maintaining international peace and security | 15 members, five with a veto |
| Economic and Social Council | Coordinating economic, social, and environmental work | Links many agencies and development goals |
| International Court of Justice | Principal judicial organ, based in The Hague | Settles legal disputes between states |
| Secretariat | Day-to-day administration, led by the Secretary-General | International civil service |
| Trusteeship Council | Oversaw decolonisation of trust territories | Suspended operations in 1994 |
The Trusteeship Council completed its historic task as territories gained self-government and suspended operations in 1994. It has not been formally abolished, because doing so would require amending the Charter.
How does the General Assembly work?
The General Assembly is the main deliberative, policymaking, and representative organ of the UN. It is the only body with universal membership, and every member state has a single, equal vote regardless of size or wealth. The Assembly debates the full range of international issues, adopts the organisation’s budget, elects non-permanent members of the Security Council, and appoints the Secretary-General on the Security Council’s recommendation.
Most General Assembly resolutions are recommendations rather than binding law. Their power lies in their moral and political weight: they express the collective view of the international community and can shape norms, pressure governments, and guide the wider UN system, even without the force of enforcement.
How does the Security Council maintain peace?
The Security Council has primary responsibility for the maintenance of international peace and security. It has 15 members, each with one vote, and its decisions are binding on member states in a way that General Assembly resolutions generally are not. The Council can call for the peaceful settlement of disputes, impose sanctions, authorise peacekeeping operations, and, in extreme cases, authorise the use of force.
Five members hold permanent seats, and the other ten are elected for two-year terms. On substantive matters a decision needs nine affirmative votes and no veto from any of the five permanent members. This veto power means that any one permanent member can block a resolution, a design that reflects the balance of power in 1945 and that remains a frequent subject of reform debates.
Who leads the UN and how is it funded?
The Secretariat carries out the day-to-day work of the organisation and is headed by the Secretary-General, who serves as the UN’s chief administrative officer and most visible public representative. The Secretary-General is appointed by the General Assembly on the recommendation of the Security Council, and the role combines management of the international civil service with diplomacy, from mediating disputes to drawing global attention to emerging crises.
The UN is financed chiefly by its member states. Contributions to the regular budget and to the separate peacekeeping budget are assessed according to a formula that takes into account each country’s capacity to pay, and states also make voluntary contributions to many funds and programmes. Because the organisation depends on members paying what they owe, late or withheld payments can strain its finances and limit what it is able to do.
What does the rest of the UN system do?
Beyond the principal organs, a wider network carries out much of the UN’s practical work. Specialised agencies, funds, and programmes address specific fields, from health and children’s welfare to refugees, food, education, and labour. These bodies have their own governing structures and budgets but coordinate through the Economic and Social Council and with the Secretariat. Importantly, the UN has no army of its own; peacekeeping relies on personnel and funding contributed voluntarily by member states.
This wider system is where most people encounter the UN in daily life. Agencies deliver vaccines and food aid, coordinate responses to disease outbreaks, set technical standards for aviation and telecommunications, protect refugees, and support education and labour rights. Because these bodies operate on the ground in many countries, the practical reputation of the UN often rests as much on their work as on the high-profile debates of the General Assembly or the Security Council.
Understanding how the UN works means recognising this layered design: a deliberative assembly where all states are equal, a security body where a few hold special powers, a court for legal disputes, an administrative core, and a broad system of agencies delivering services worldwide. Its effectiveness depends less on formal authority than on the cooperation, funding, and political will of its members.
That reliance on member cooperation explains both the organisation’s reach and its recurring frustrations. When major powers agree, the UN can coordinate action across borders on a scale no single country could manage alone. When they are divided, especially within the Security Council, its capacity to act can stall. Debates about reform, including proposals to change the Council’s membership or the use of the veto, reflect an ongoing effort to keep an institution designed in 1945 responsive to a very different world.
Frequently Asked Questions
When was the United Nations founded and why?
The United Nations was established in 1945, after the Second World War, when representatives of 50 countries drafted the UN Charter. Its founding purposes include maintaining international peace and security, developing friendly relations among nations, promoting cooperation on economic and social problems, and encouraging respect for human rights.
What are the six principal organs of the UN?
The UN Charter establishes the General Assembly, the Security Council, the Economic and Social Council, the Trusteeship Council, the International Court of Justice, and the Secretariat. Each has a distinct role, and together they divide the deliberative, executive, judicial, and administrative work of the organisation.
How does the Security Council's veto work?
The Security Council has 15 members, including five permanent members. On substantive matters, a decision requires nine affirmative votes and no veto from any permanent member. This means any one of the five permanent members can block a substantive resolution by voting against it.
Does the UN have its own army?
No. The UN has no standing army of its own. For peacekeeping it relies on personnel contributed voluntarily by member states, operating under UN command with mandates authorised by the Security Council. Funding and troops depend on the cooperation of members.
What is the difference between the UN and its specialised agencies?
The six principal organs form the core of the UN itself, while specialised agencies, funds, and programmes make up the wider UN system. Bodies such as the World Health Organization and UNICEF have their own governance and mandates but coordinate with the UN on shared goals.
