This is the 762nd most frequent Danish word.
em
The Danish word "em" refers to the European Championship in sports.
In this sentence, 'om' is used as a preposition meaning 'about'.
Jeg har læst en bog om naturens vidundere.
I have read a book about the wonders of nature.
Here, 'om' is used as a conjunction meaning 'whether'.
Vi diskuterede om vi skulle tage på ferie.
We discussed whether we should go on a holiday.
In this case, 'om' is used in a clause expressing a condition, translating as 'whether'.