Arion is a very special horse that comes from ancient Greek mythology. In those old stories, Arion was said to be the fastest horse in the whole world! He was so fast that nobody could catch him, not even the other horses.
People loved Arion so much because he was not just fast, but also very beautiful. He had a shiny coat and a long mane that flowed in the wind. And when he ran, it looked like he was flying! People would come from all over just to see him.
Nowadays, people still talk about Arion and even name horses after him. But these days, horses like Arion are used for many different things. Some people like to ride them for fun or for sport, while other people use them to pull carts or plow fields.
So even though Arion is just a story now, he's still a very special horse that people remember and admire.