PCI DSS is the acronym for Payment Card Industry Data Security Standard. It is a set of policies and procedures intended to keep credit and debit card users' information safe for both online and offline transactions, according to the PCI Security Standards Council.
Protecting card users includes preventing, detecting and appropriately responding to data breaches and applies to any business that accepts, stores, processes or transmits card information. The PCI DSS covers the transaction from the vendor's point-of-sale computers and paperwork storage through encrypting the data and transmitting to the card issuer. All vendors are required to assess the security of their data systems, including any third parties with access to the processing of card data.