What is the significance of United Nations?

The United Nations is an international organization founded in 1945 after the Second World War by 51 countries committed to maintaining international peace and security, developing friendly relations among nations and promoting social progress, better living standards and human rights.

The UN is like a giant alliance for giant nations.

Explanation:

The aim of the United Nations system is to prevent war from happening, restoring security, protecting people and advancing human development and social progress.