What is a 4-digit PIN-code?

A 4-digit PIN-code is a security measure, which is used in the process of authenticating a user accessing a system, and is aimed at preventing unsanctioned use of sensitive data. A PIN is numeric code, which serves as a secondary form of verification. It is very important to remember your PIN. It cannot be changed or restored. Because PINs protect sensitive information, it is highly recommended to use a PIN that is difficult to guess.