The dative case is used to show the indirect object of a verb, typically the recipient of an action.
Sentences
She gave him a book.
He sent her a letter.
German: Ich gebe dir das Buch. (I give you the book.)
Spanish: Le di el regalo a mi hermana. (I gave the gift to my sister.)
Russian: Я дал ей цветы. (I gave her flowers.)