Viking refers to people in a specific historical era; not used for modern Scandinavians. The Viking Age is a fascinating period of Scandinavian history.
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Not Pirates
Vikings were explorers and traders too, not just raiders as often misconceived. Vikings established trade routes all the way to Byzantium.
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Cultural Impact
The Viking legacy influences today's culture, myths, and even languages. English has many words borrowed from the Vikings, like 'sky'.