In Poland, there are some places called bilingual communes. Bilingual means that two languages are used - one is Polish and the other is a different language, like German or Kashubian. In these communes, people use both languages for things like talking to each other, writing signs, and making official documents.
For example, if you lived in a bilingual commune in Poland and your family spoke both Polish and German, you could go to school and learn in either language. If you went to the grocery store, there might be signs in both languages telling you what things are. If you needed to fill out official paperwork, it could be in both languages so you could understand it better.
Being bilingual can be really helpful because it means you can communicate with more people and understand different cultures better. And in Poland, these bilingual communities are important for making sure both languages and cultures are respected and supported.