This is the 9th most frequent Italian word.
le
The Italian word "le" is the plural definite article for feminine nouns, meaning "the" in English. It can also mean "to her" or "to them" (feminine) as an indirect object pronoun.
In this sentence, 'le' functions as an indirect object pronoun, referring to 'her'.
Le ho dato il libro.
I gave her the book.
Here, 'le' is the definite article used in plural feminine form, referring to the roses.
Le rose nel giardino sono bellissime.
The roses in the garden are beautiful.
In the second occurrence in this sentence, 'le' acts as a direct object pronoun, referring to 'them' being feminine objects.