Okay kiddo, have you ever seen a big window in a fancy building that looks like a flower? That's called a rose window! It's made up of lots of small pieces of colored glass, just like a puzzle.
Rose windows are usually found in big churches or cathedrals, and they're usually right above the main entrance, so when you walk in, you see a big, beautiful, glowing flower!
Some rose windows have pictures of saints or scenes from the Bible in them, and they're really important in religious architecture. But even if you're not into that stuff, rose windows are still really cool to look at!