The United Nations is a really BIG group of countries from around the world that come together to talk about important things like peace, health, and education. One of the things they talk about is something called disarmament, which means taking away weapons like guns or bombs so people can be safer.
The United Nations has a special office that is in charge of helping countries talk to each other about disarmament. This office is called the United Nations Office for Disarmament Affairs. They help countries work together to make sure that there are fewer dangerous weapons in the world.
They do this by helping countries talk to each other, make laws, and come up with solutions that can help prevent wars and other problems that can happen when countries have too many weapons. They also help people learn more about why it is important to get rid of dangerous weapons and work to raise awareness about the issue.
Overall, the United Nations Office for Disarmament Affairs is like a group of grown-ups who help countries work together to make the world a safer place to live.