How to deposit money in my friend's account?

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We both have different bank accounts in two different banks living far from each other. How should I deposit money into her account? Should I go to one of the branches of her bank. Suppose I am having my account in PNB, and her in HDFC's account, so do i need to go to HDFC bank to fill the deposit slip there to make it done? I know you gave me answer, probably I need a clear concept. Thanks

How to deposit money in my friend's account?