So, there are some countries in the world that have a lot of something called oil. Oil is like a really important juice that we use to make cars go and airplanes fly and even for heating our houses. Some of these countries are in a group called the Arab Petroleum Exporting Countries, or OPEC for short.
This group of countries helps each other by working together to decide how much oil they are going to sell and for how much money. They also work together to protect their oil supplies and make sure they are being used in the best way for everyone.
It's kind of like when you and your friends work together on a project at school. You talk to each other and come up with a plan so that everyone is happy and the project turns out great! OPEC is like that, except instead of a school project, they are working together to make sure the world has enough good, clean energy to keep things running smoothly.