The first worldwide organization to maintain peace was formed in 1920 and was names as The League of Nations. However it failed to fulfill its purpose. Later United Nations (UN) was formed in 1945 with the aim of preventing another world war. It is the world’s largest and most powerful international organization. Just when it was founded it had 51 members but now there are over 193 countries in it. UN has six principal organs: the General Assembly; the Security Council, the Economic and Social Council (ECOSOC), the Trusteeship Council, the International Court of Justice, and the UN Secretariat. Furthermore it has various agencies:
UNICEF:
United Nations Children’s Fund is responsible for the welfare of the children worldwide which include various activities like immunization, disease preventing, providing nutrition etc. Earlier it was known as United Nations Children’s Emergency Fund because it was used to provide funds only during an emergence but now it is functional throughout.
UNESCO: 
The United Nations Educational, Scientific and Cultural Organization aims at providing education for all, preserve regional and cultural history, and promote cultural diversity. Its headquarter is at the World Heritage Centre in Paris, France.
WHO:
The World Health Organization is responsible for international public health. The WHO was established on 7 April 1948, which is commemorated as World Health Day. It is actively providing support against various diseases like Corona Virus. Its headquarter is at Geneva, Switzerland.
ILO:
The International Labour Organization was initially an agency of Leagues Of Nations and was formed in 1919 and became a part of UN after the LON got disintegrated. It aims at providing support to the people who are indulged in labour. Its headquarters are in Geneva, Switzerland.
WBG:
World Bank Group is the the largest and most well-known development bank in the world. It consists of 5 international organizations. It aims at ending poverty and building shared prosperity. Its five organizations are the International Bank for Reconstruction and Development (IBRD), the International Development Association (IDA), the International Finance Corporation (IFC), the Multilateral Investment Guarantee Agency (MIGA) and the International Centre for Settlement of Investment Disputes (ICSID).
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