Le doy el libro.
English: I give him/her the book.
Indirect object pronouns in Spanish are small words (me, te, le, nos, os, les) that show to whom or for whom the action of the verb is done.
Use these pronouns when you want to say to whom or for whom something is given, told, sent, or done. They are often used with verbs like 'dar' (to give), 'decir' (to say/tell), 'enviar' (to send), and 'mostrar' (to show).
Le doy el libro.
English: I give him/her the book.
Nos escriben una carta.
English: They write us a letter.
Te cuento una historia.
English: I tell you a story.
Les enviamos flores.
English: We send them flowers.
Me muestran la casa.
English: They show me the house.