A Model United Nations (Model UN or MUN) is an educational simulation in which students take part in simulated UN committees as delegates from an assigned country. It is a great opportunity to learn about diplomacy, international relations, and the United Nations. It expands their public speaking, debating, research and writing skills, in addition to critical thinking, teamwork, and leadership. Such experiences are crucial in preparing youth for future careers in international affairs.
The National Model UN (NMUN) is one of the oldest Model UN events bringing together over 5,000 university students in New York City to discuss current global issues. Delegates come prepared to solve three pressing issues relevant to the 21 simulated UN committees. The NMUN “envisions a world comprised of civically engaged people who strive for peaceful, multi-lateral conflict resolution and equitable, sustainable human development.”
Learn more on the official NMUN website.
To get an idea of the rules, have a look at this.