The Council of Europe is like a club for countries in Europe. This club was made a long time ago after World War 2 to help make peace and cooperation among European countries. Think of it like how you have friends in your class, and you all work together to make sure everyone gets along and plays nicely together.
In this club, each country sends representatives to meet and talk about things that are important for all of the countries. They talk about things like human rights (making sure everyone is equal and treated fairly), democracy (when the people get to choose who leads their country), and culture (all the cool things that make each country special). They also help countries create and follow rules that make sure everyone is safe and healthy, like making sure everyone has clean drinking water and school for kids.
Think of the Council of Europe as a big group of friends who work together to make sure everyone is happy and gets along. It's important because when people work together and help each other, everyone can have a better life.