This is the 36th most frequent Catalan word.
li
The Catalan word "li" is an indirect object pronoun meaning "to him," "to her," or "to it."
In this sentence, 'li' is combined with the verb 'donar' (to give) to indicate the recipient of the message.
Podeu donar-li aquest missatge, si us plau?
Can you give her/him this message, please?
Here, 'li' is an indirect object pronoun referring to 'her' or 'him'. It indicates the person to whom the book was given.
Li vaig donar el llibre ahir.
I gave her/him the book yesterday.
Here, 'li' is used as an indirect object pronoun to indicate the person he speaks to.