What is a royal edition of a video game and how does it differ from the regular version of the game?

I was looking at a video game that I really want and I was on a foreign site. When I clicked on a certain link, it brought me to a different site that was selling the regular version of the video game and the royal version of the game. Good details would help me a lot.What is a royal edition of a video game and how does it differ from the regular version of the game?the royal version is the whole package while the regular just a cd game with no extras but a royal has extras in games its comes with limited edition items inside the box as well