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How are Danish and Swedish related?

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Thematic map of Europe displaying the distribution of Germanic languages, with different colors indicating regions where English, German, Netherlandic (Dutch), Frisian, Swedish, Danish, Norwegian, Icelandic, and Faroese are spoken. Striped areas mark regions where bilingualism is common, and language regions cover countries such as the United Kingdom, Germany, the Netherlands, Denmark, Sweden, Norway, Iceland, and parts of surrounding countries. — Germanic languages Distribution of the Germanic languages in Europe.

Danish and Swedish are closely related languages within the North Germanic branch of the Germanic languages family. Specifically, they are both classified as part of the East Scandinavian group, a distinction based on shared linguistic innovations that separate them from the West Scandinavian languages (Norwegian, Icelandic, and Faroese).1234

Historically, these languages developed from a common parent language and were part of a relatively uniform dialect continuum in Scandinavia. By the Middle Ages, they began to diverge further, with Danish and Swedish emerging as distinct standard languages. Despite their differences, they remain closely related, sharing fundamental grammatical features such as the use of enclitic definite articles—where the article is placed after the noun—and a simplified gender system compared to many other Germanic languages. While they have undergone different sound changes over time, they share a common ancestry as historical developments of the same earlier parent language.5467829