This is the 49th most frequent German word.
ihr
"ihr" = "her," "their," or "you (plural informal)" depending on context.
In this sentence, 'ihr' is a possessive pronoun meaning 'her', indicating ownership.
Ihr Auto ist neu.
Her car is new.
Here, 'ihr' functions as an indirect object pronoun in the dative case, meaning 'her' and referring to the person receiving the books.
Gebt ihr die Bücher.
Give her the books.
In this example, 'ihr' is a personal pronoun in the nominative case, used as the subject and referring to 'you' when addressing a group informally.