The Vikings were originally diverse Scandinavian seafarers from Norway, Sweden, and Denmark (though other nationalities were later involved) whose raids and subsequent settlements significantly impacted the cultures of Europe and were felt as far as the Mediterranean regions c. 790 - c. 1100 CE. The Vikings were all Scandinavian but not all Scandinavians were Vikings.
This is a companion discussion topic for the original content at https://www.worldhistory.org/Vikings/.