What is a PIN number?
A personal identification number (PIN or PIN number) a numeric or alphanumeric number which is commonly used as a password or a code. It serves for authentication and identification of users to a system. A PIN code often is used in combination with a card or other additional means. Common systems that use a PIN number are for example ATM machines or in europe for example mobile SIM cards. PIN's additionally may be used to authenticate for example governments with citizens, enterprises with employees, and computers with users.