Polish Independence Day is a special day when Polish people celebrate their country becoming independent. Before this day, Poland used to be controlled by other countries and didn't have its own government. But on November 11th, 1918, Polish people came together and made their own country with their own government. Now every year on the same day, people in Poland celebrate this special day by having parades, lighting fireworks, and singing songs about their country. It's like a big birthday party for Poland!