Macedonia is a region in Europe that covers parts of many different countries. One of these countries is Greece, which is located in the southeastern part of Europe.
Now, some people in Greece and other places argue about who should get to use the name "Macedonia." This is because there used to be a country called the Republic of Macedonia, which is located just north of Greece. Some people in Greece think that the name Macedonia refers only to their region, and they don't want anyone else to use it.
So, there has been a lot of debate and arguments between Greece and the neighboring country of North Macedonia (which used to be called just Macedonia) about who gets to use the name "Macedonia." This is why the issue of Macedonia is a very complicated and controversial topic in Greece.