The language in Denmark is Danish. It is familiar to the Scandinavian languages, Swedish and Norwegian.
Besides the scandinavian languages, most people here, understand and speak English.
If you wish to learn a few Danish words, here is some help to get you started:
Hello: Hej
Goodbye: Farvel
Good morning: God morgen
Good afternoon: God dag
Good night: God nat
Thank you: Tak
My name is: Mit navn er/ Jeg hedder
Denmark: Danmark
Cheers: Skål