Intergovernmentalism is like when you play with your friends, but your parents have to help make the rules. When countries work together, they also have to make rules and decisions. This is called intergovernmentalism.
Let's say that you and your friends want to build a treehouse. You might all have different ideas about how to build it, what materials to use, and even what color to paint it! But your parents would help you all come up with some rules, like everyone gets a turn to share their idea or everyone has to work together.
When countries work together, they also have different ideas and needs. But instead of parents, they have leaders and officials who make agreements and rules about how to work together. This can be about things like trade, security, or the environment.
Intergovernmentalism helps countries work together better, just like having rules helps you and your friends build a better treehouse. It's not always easy, but it can make things better for everyone in the long run!