Okay, kiddo, let me explain to you what a rök stone is. Rök stone is a really, really old rock that has writing on it. It comes from a time long, long ago when people didn't have computers, phones or even books to write things down. Instead, they used rocks to carve important messages and stories.
The rök stone is special because it has an old language carved on it that we don't use anymore. It's called the "Old Norse" language, and it's what people spoke a long time ago in places like Sweden, Norway and Denmark.
The rök stone was discovered in Sweden in 1860 and it's very important to historians and people who study old languages because it helps us understand what people used to believe and how they lived. There are a lot of symbols and pictures on the rök stone that tell a story about a mythological character named Odin, who was kind of like a superhero in the old Norse stories.
So, that's pretty much what a rök stone is, it's just an old rock with a story carved on it in a language we don't use anymore. But it's really cool because it helps us learn about our history and how people used to live a long, long time ago.