The PCI DSS is a set of security standards designed to improve payment account security and prevent fraud throughout the transaction process by increasing control of credit card data. Compliance with the PCI DSS is required of all companies that process, store, or transmit credit card information through the five major payment card brands: American Express, Discover, the Japan Credit Bureau (JCB), MasterCard, and Visa.
Based on the total transaction volume over a 12-month period, companies are evaluated and classified at one of four levels, ranging from Level 1 for companies processing over 6 million transactions annually to Level 4 with fewer than 20,000 transactions a year.
The PCI Security Standards Council (PCI SSC), an independent body created by the major payment card corporations, sets the standards, administers the PCI DSS, and manages its ongoing evolution.