Okay, so imagine you have a bunch of countries that are near each other but they don't always get along or work together very well. That's what it was like for some countries in Europe and some countries in Africa and the Middle East.
But then some people had an idea. They said, "What if we all joined together in a big group and talked about things we can do together to help everyone?" This big group is called the Union for the Mediterranean.
Now, when all these countries talk and work together, they can do things like make it easier to travel between countries or work together to protect the environment. They can also try to solve problems together, like helping people who don't have enough food or water.
So the Union for the Mediterranean is like a big group of friends who want to help each other out and make sure everyone is doing okay.