This is the 18th most frequent Danish word.
hvor
"Where."
In this case, 'hvor' is used as an interrogative modifier for 'mange' to ask about quantity.
Hvor mange mennesker er der her?
How many people are here?
Here, 'hvor' is used as an interrogative adverb to ask about the location.
Hvor bor du?
Where do you live?
In this sentence, 'hvor' functions as an interrogative conjunction connecting the clause to indicate a place.