A Personal Identification Number, or PIN, is a unique numeric code used to authenticate a user’s identity. It is commonly used in banking and electronic transactions to provide an extra layer of security. Users typically create their own PIN to access accounts, ATMs, or mobile devices, ensuring that only they can perform certain actions. PINs usually consist of four to six digits, making them easy to remember but still secure enough to protect sensitive information. It is important for users to keep their PINs confidential and to change them regularly to prevent unauthorized access to their accounts.