When an object is transferred to someone or for someone, the receiver of the object will be in the dative case.

Here are some examples:

I gave him the ball : मैंने उसको गेंद दी 

You brought food for me : आप मेरे लिए खाना लाए

Ramesh sings for you : रमेश आपके लिए गाती है

We gave them a letter (we gave a letter to them) : हमने उसको पत्र दिया

They cooked food for us : उन्होंने हमारे लिए खाना बनाया

To be more exact, the dative of a sentence like this “I give money to the woman” is “to the woman”. 

The dative also has a contracted form as well.

For example, “to me” is मुझको but a contracted form of this is मुझे

“to us” is हमको and the contracted form is हमें

“to you” familar तुमको, contracted form = तुम्हें

“to you” polite आपको no contracted form of आपको 

 “to him, her” उसको, contracted form = उसे

“to them” उनको, contracted form = उन्हें

Here’s an example of a sentence using a contracted form:

We gave money to him : हमने उसे पैसे दिए