Nuclear disarmament

Nuclear disarmament is when countries agree to get rid of their nuclear weapons. Nuclear weapons are like really really big bombs that are so powerful, they can destroy whole cities in one blast. It's like if you took all the firecrackers you have ever seen and strapped them together, and then put them in one spot and lit them all off at once – that's how strong a nuclear weapon is.

So, when countries agree to get rid of their nuclear weapons, it means they don't want to hurt each other with them anymore. It's like them deciding to not use their fire crackers anymore and instead, just play a game together. This can help make the world a bit safer.