Here's a breakdown:
* Old Norse was the common language of the Vikings, used in Scandinavia and areas they explored, including parts of Britain, Ireland, France, and Russia.
* Runes were the primary writing system for Old Norse. These were carved into wood, stone, and bone.
* Latin was also used, especially in religious contexts and for official documents.
* Old West Norse was spoken in Norway and Iceland, while Old East Norse was spoken in Denmark and Sweden.
While "Viking" isn't a language itself, it's a term used to describe a period of Norse history and culture. It's important to remember that people who spoke Old Norse weren't necessarily "Vikings" – it was simply their language.