Okay kiddo, so you know how different countries have different flags, right? Well, one of the flags that some countries in northern Europe use is called the Nordic cross flag. It's called that because it looks like a big plus sign (+) in the middle of the flag, and it's used by countries like Sweden, Norway, Finland, Denmark, Iceland, and a few others.
Now, the colors on the flag are usually pretty simple too. It's mostly just a plain background color, like blue or red or white, with a smaller cross shape on top of it in a different color. For example, Sweden's flag is blue with a yellow cross, while Finland's flag is white with a blue cross.
So why do these countries use this particular flag? Well, one reason is that they all have a shared history and culture in that part of Europe, so it makes sense to have a symbol that represents that. Plus, the Nordic cross is a pretty simple and straightforward design, which makes it easy to recognize and remember.
Overall, the Nordic cross flag is a way for countries in northern Europe to show their pride and unity, and it's become a symbol that's recognized around the world.