PCI:DSS is the Payment Card Industry Data Security Standard. It is the universal standard that applies to any organisation that stores, processes or transmits Cardholder Data (Primary Account Number and its associated data). The Standard covers any branded payment card (Visa, MasterCard, JCB, Discover, Amex.) and is policed by the Aquiring Banks under their contracts with retailers.
See our blog article, What is PCI DSS?