# Glossary
source: https://developer.mastercard.com/user-account-management-service/documentation/glossary/index.md

#### Commonly used terms {#commonly-used-terms}

|                    Term                    | Abbreviation |                                                                                                                                                                           Description                                                                                                                                                                           |
|--------------------------------------------|--------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Account                                    |              | An account is a unique card.                                                                                                                                                                                                                                                                                                                                    |
| Bank Customer Number                       | BCN          | Uniquely identifies a cardholder and can have several accounts associated to it. It is provided by the client.                                                                                                                                                                                                                                                  |
| Bank Account Number Primary Account Number | BAN or PAN   | Uniquely identifies a cardholder and can be a card number, bank account number or other client account number.                                                                                                                                                                                                                                                  |
| Card-Linked Service                        | CLS          | Card Linked Services (CLS) is a system that links a consumer's credit or debit card to a loyalty program, enabling automatic rewards, cashback, or discounts when the card is used for purchases at participating merchants. CLS is often used to deliver personalized promotions based on spending behavior, helping to boost customer loyalty and engagement. |
| Offers for Publishers                      | Offers       | Offers match merchant offers to a specific audience of cardholders.                                                                                                                                                                                                                                                                                             |
| Random Account Number                      | RANAC        | A token generated by Mastercard that uniquely identifies an account.                                                                                                                                                                                                                                                                                            |
| Random Customer Number                     | RANCU        | A token generated by Mastercard that uniquely identifies a customer.                                                                                                                                                                                                                                                                                            |
| User                                       |              | A user is a unique cardholder.                                                                                                                                                                                                                                                                                                                                  |