Okay, kiddo, so there's this big group of countries in the world and they want to work together to stop climate change. It's called the United Nations Framework Convention on Climate Change, or UNFCCC for short.
Basically, they all agreed that the Earth is getting warmer and it's a big problem. They want to figure out ways to stop it from getting even warmer so that we can take care of our planet for future generations.
The UNFCCC has meetings where people from all these countries come together and talk about ways to reduce the amount of pollution in the air, and how to use energy and resources in smart ways. They also talk about how to help poor countries who might be affected most by climate change, and how everyone can work together to make the world a better place.
So, the UNFCCC is like a big group of friends who want to make the world a better place by working together to stop climate change.