Personal identification number(PIN)- Short Note of IT-DAIBB

A personal identification number (PIN, pronounced "pin"; often redundantlyPIN number) is a numeric password shared between a user and a system, that can be used to authenticate the user to the system. Typically, the user is required to provide a non-confidential user identifier or token (the user ID) and a confidential PIN to gain access to the system. Upon receiving the user ID and PIN, the system looks up the PIN based upon the user ID and compares the looked-up PIN with the received PIN. The user is granted access only when the number entered matches with the number stored in the system. Hence, despite the name, a PIN does not personally identify the user.

PINs are used with banking systems (where the identifying token is a card), but are also used in other, non-financial systems.The PIN is not printed or embedded on the card but is manually entered by the cardholder during automated teller machine (ATM) and point of sale (POS) transactions (such as those that comply with EMV), and in card not present transactions, such as over the Internet or for phone banking.