This is the 1st most frequent Croatian word.
je
"Je" is the Croatian word for "is."
In this interrogative sentence, 'je' is used as part of the question structure in Croatian, combined with 'li' to form a yes-or-no question.
Je li ovo tvoja torba?
Is this your bag?
In this sentence, 'je' is used as a copula verb, linking the subject ('Ovo') with its attribute ('knjiga').
Ovo je knjiga.
This is a book.
Here, 'je' serves as the third person singular form of the auxiliary verb 'to be' in the present tense.