"Card Standard" refers to a standard used to measure credit rating, identity and eligibility. Such standards are typically set by credit agencies, industry associations, or government regulators. Card marks are commonly used to evaluate applicants for loans, credit cards, jobs, rent and insurance. Applicants need to meet certain card standards to be approved and enjoy better terms and interest rates in these areas. The higher the rating, the more creditworthy the applicant is and the lower the risk.

Card mark can also be interpreted as a specific mark on a certain card. For example, the card logo on a bank credit card may indicate the type of card, its reputation, special features, or the bank to which it belongs. In some cases, a card logo may also be used as a proprietary name or trademark to better identify the card or service it represents.

"Card label" may also refer to a system of indicating whether a card or label is valid. For example, in places such as buses, subways, train stations, and airports, it is usually necessary to hold a valid card to enter or use specific service facilities. These cards will usually have a logo or combination of logos on them to indicate that the card is approved or valid for staff and security personnel to determine. These signs are often called "card signs" and may vary among cities and facilities.