A PIN is essentially a numeric password. It's to make sure that only you or anyone you trust with the number can access the bank account, phone minutes, or whatever else the card may be tied to.
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The money is entitled to you not anybody else, so privacy is needed. This is why a PIN is needed when setting up a bank account.
So that no one other than you can access the card if it gets lost
If your ATM card is blocked, call up customer care and explain the situation. They will reset the PIN number and send you a new PIN using which you can start using your ATM card. If your ATM card is stolen and you want to block it, call up customer care and explain them that your ATM card is stolen and they will block it for you.
A bank envelope and your ATM card along with a personal pin number that was assigned to your card
ATM PIN is stored as secured information in the magnetic strip of the card, which is recognized by the machine once the card is put in and PIN is typed. To know more about secured ATM PIN check Nationalcash.