Okay, kiddo! So imagine that you have a group of people who live in one country called Ukraine, and they want to go live in another country called Poland. Some of them might want to live there because they have family or friends who already live there. Others might want to live there because they think they can find better jobs or make more money there.
But going to live in a new country can be scary and difficult sometimes. The people who want to go live in Poland might need to learn a new language, find a place to live, and figure out how to make a living. It's kind of like starting over from scratch!
Sometimes, when lots of people from one country go to live in another country, it's called "migration." And sometimes, when people move from one country to another, they bring their culture with them. So some Ukrainians who move to Poland might still speak Ukrainian, cook Ukrainian food, and celebrate Ukrainian holidays even though they're living in a new country.
But just because people are from different countries doesn't mean they can't get along! Ukrainians who live in Poland and Poles who were born in Poland can all be neighbors and friends. They might even learn things from each other and share their cultures with each other. That's what makes the world such a cool and interesting place!