This document provides information about the United Nations Security Council, including its origins, aims, and methods for maintaining peace. The UN Security Council was established after World War II to replace the League of Nations and maintain international peace and security. It has 15 members, including 5 permanent members with veto power, and determines actions in response to threats to peace such as sanctions, peacekeeping missions, or authorizing military action as a last resort. The effectiveness of the UN Security Council is mixed, as interventions have had failures like in Somalia but successes such as stabilizing Sierra Leone.