könyveknek
"könyveknek" is the dative plural form of the Hungarian word "könyv," which translates to "book" in English. In the Hungarian language, case endings are appended to nouns to indicate their grammatical function within a sentence. The dative case typically expresses the indirect object of a verb, signifying "to" or "for" someone or something. Therefore, "könyveknek" specifically means "to books" or "for books."
This grammatical form would appear in sentences where books are the recipient of an action or are