The United Nations is an international organization, which main purposes are to maintain international peace and security, to develop friendly relations among nations, to achieve international cooperation in solving international problems, and to be a center for harmonizing the actions of nations. This organization was founded in 1945 and it is currently made up of 193 Member States. Model United Nations, also known as Model UN or MUN, is an activity in which students roleplay delegates to the United Nations and simulate UN committees.