ATM Access is a term used to describe the process of using an Automated Teller Machine (ATM) to access one's bank account. It requires two pieces of information: a Personal Identification Number (PIN) and a PIN number. The PIN is a three-letter code that is used to authenticate the user, while the PIN number is a nine-digit code that is used to access the account. Together, these two pieces of information allow the user to access their bank account through an ATM.