The United Nations is an international organization founded in 1945. Currently made up of 193 Member States, the UN and its work are guided by the purposes and principles contained in its founding Charter.

The United Nations was created in 1945, following the devastation of the Second World War, with one central mission: the maintenance of international peace and security. The UN accomplishes this by working to prevent conflict, helping parties in conflict make peace, deploying peacekeepers, and creating the conditions to allow peace to hold and flourish. These activities often overlap and should reinforce one another, to be effective.

The UN Charter, in its Preamble, set an objective: "to establish conditions under which justice and respect for the obligations arising from treaties and other sources of international law can be maintained". Ever since, the development of, and respect for international law has been a key part of the work of the Organization.

In 1948, the Universal Declaration of Human Rights lay down the principles that brought human rights into the realm of international law. Since then, the Organization has diligently protected human rights through legal instruments and on-the-ground activities.

To its initial goals of safeguarding peace, protecting human rights, establishing the framework for international justice and promoting economic and social progress, in the seven decades since its creation the United Nations has added on new challenges, such as AIDS, big data and climate change. While conflict resolution and peacekeeping continue to be among its most visible efforts, the UN, along with its specialized agencies, is also engaged in a wide array of activities to improve people’s lives around the world – from disaster relief, through education and advancement of women, to peaceful uses of atomic energy.

Goal 16 is about promoting peaceful and inclusive societies, providing access to justice for all and building effective, accountable and inclusive institutions at all levels. People everywhere should be free of fear from all forms of violence and feel safe as they go about their lives whatever their ethnicity, faith or sexual orientation.

The United Nations Institute for Disarmament Research is a voluntarily funded autonomous institute within the United Nations. An impartial actor, the Institute generates ideas and promotes action on disarmament and security. UNIDIR brings together states, international organizations, civil society, the private sector and academia to work together—internationally, regionally and locally—to build and implement creative solutions that will benefit all states and peoples.

The United Nations is part of the UN system, which, in addition to the UN itself, comprises many funds, programmes and specialized agencies, each of which have their own area of work, leadership and budget. The programmes and funds are financed through voluntary rather than assessed contributions. The Specialized Agencies are independent international organizations funded by both voluntary and assessed contributions. The UN coordinates its work with these separate UN system entities, which cooperate with the Organization to help it achieve its goals.