This is the 6080th most frequent Swedish word.
karin
"Karin" is a Swedish female given name, equivalent to "Karen" in English.
Here, 'Karin' is used as a proper noun to refer to a person's name.
Karin tycker om att läsa böcker.
Karin likes to read books.
In this sentence, 'Karin' functions as a pronoun reference to a specific individual mentioned in the context.
Jag såg Karin på festen igår kväll.
I saw Karin at the party last night.
'Karin's' here is used as a possessive form to describe something belonging to Karin, showing ownership in Swedish with the suffix -s attached to the name.