Classification
Danish, together with Swedish, derives from the East Norse dialect group, while the old Norwegian dialects before the influence of Danish and Bokmål is classified as a West Norse language together with Faroese and Icelandic. A more recent classification based on mutual intelligibility separates modern spoken Danish, Norwegian and Swedish into a Mainland Scandinavian group while Icelandic and Faroese are placed in a separate category labelled Insular Scandinavian.
Written Danish and Norwegian Bokmål are particularly close, though the phonology (that is, the system of relationships among the speech sounds that constitute the fundamental components of the language) and the prosody (the patterns of stress and intonation) differ somewhat. Proficient speakers of any of the three languages can understand the others, though studies have shown that speakers of Norwegian generally understand both Danish and Swedish far better than Swedes or Danes understand each other. Both Swedes and Danes also understand Norwegian better than they understand each other's languages.
Read more about this topic: Danish Language