This is the 448th most frequent Swedish word.
vem
"Vem" means "who" in English.
Here, 'vem' is used as an interrogative pronoun to inquire about the identity of a person.
Vem är ansvarig för projektet?
Who is responsible for the project?
In this sentence, 'vem' introduces a subordinate clause and serves as a connector referring to an unspecified person.
Jag vet vem som skrev brevet.
I know who wrote the letter.
Here, 'vem' is used to inquire about a specific person to address or interact with, functioning as the object of the second clause.