The United Nations Security Council (UNSC) is one of the principal organs of the United Nations and is charged with the maintenance of international peace and security. Its powers, outlined in the United Nations Charter, include the establishment of peacekeeping operations, the establishment of international sanctions, and the authorization of military action. Its powers are exercised through United Nations Security Council resolutions.

The Security Council held its first session on 17 January 1946 at Church House, Westminster, London. Since its first meeting, the Council, which exists in continuous session, has travelled widely, holding meetings in many cities, such as Paris and Addis Ababa, as well as at its current permanent home at the United Nations Headquarters in New York City.

There are 15 members of the Security Council, consisting of five veto-wielding permanent members—China, France, Russia, the United Kingdom, and the United States—based on the great powers that were the victors of World War II, and 10 elected non-permanent members with two-year terms. This basic structure is set out in Chapter V of the UN Charter. Security Council members must always be present at UN headquarters in New York so that the Security Council can meet at any time. This requirement of the United Nations Charter was adopted to address a weakness of the League of Nations since that organization was often unable to respond quickly to a crisis.

Security is the degree of protection against danger, damage, loss, and crime. Security as a form of protection are structures and processes that provide or improve security as a condition. The Institute for Security and Open Methodologies (ISECOM) in the OSSTMM 3 defines security as "a form of protection where a separation is created between the assets and the threat". This includes but is not limited to the elimination of either the asset or the threat. Security as a national condition was defined in a United Nations study (1986)^{[citation needed]}, so that countries can develop and progress safely.

Security has to be compared to related concepts: safety, continuity, reliability. The key difference between security and reliability is that security must take into account the actions of people attempting to cause destruction.

Different scenarios also give rise to the context in which security is maintained:

Perception of security may be poorly mapped to measureable objective security. For example, the fear of earthquakes has been reported to be more common than the fear of slipping on the bathroom floor although the latter kills many more people than the former. Similarly, the perceived effectiveness of security measures is sometimes different from the actual security provided by those measures. The presence of security protections may even be taken for security itself. For example, two computer security programs could be interfering with each other and even cancelling each other's effect, while the owner believes s/he is getting double the protection.

The Congo Crisis (1960–1966) was a period of turmoil in the First Republic of the Congo that began with national independence from Belgium and ended with the seizing of power by Joseph Mobutu. At various points, it had the characteristics of anti-colonial struggle, a secessionist war with the province of Katanga, a United Nations peacekeeping operation, and a Cold War proxy battle between the United States and the Soviet Union. The Crisis resulted in the deaths of some 100,000 people (King Léopold II’s rule had resulted in the deaths of around 10,000,000 Congolese people). It led to the assassination of Prime Minister Patrice Lumumba, as well as a traumatic setback to the United Nations following the death of UN Secretary General Dag Hammarskjöld in a plane crash as he sought to mediate.

Prior to the establishment of the First Republic in 1960, the native Congolese elites had formed semi-political organizations which gradually evolved into the main parties striving for independence. These organizations were formed on one of three foundations: ethnic kinship, connections formed in schools, and urban intellectualism^{[citation needed]}.