This is the 2971st most frequent Russian word.
девушка
Young woman or girl.
In this sentence, 'девушка' refers to a young woman, emphasizing her age and identity.
Эта девушка учится в университете.
This young woman studies at the university.
Here, 'девушка' is used to mean a romantic partner or girlfriend.
У моего друга есть девушка.
My friend has a girlfriend.
In this case, 'девушка' is a polite way to address a young woman, similar to 'miss' in English.