Being PCI DSS-compliant means that you meet all applicable requirements of the current Payment Card Industry Data Security Standard (PCI DSS) on a continuous basis. PCI DSS was created by major card networks to increase safety of cardholder data and reduce the risk of fraud. All organizations that deal with payment card processing must be PCI-compliant, which means fulfilling very strict requirements on securing cardholder data.
Merchants who find it difficult or expensive to fully comply with PCI DSS requirements may consider using encrypted methods (such as Hosting the CSE library) or outsourcing card processing to a PCI-compliant payment service provider, such as Adyen. This way their PCI DSS-compliance scope can be significantly reduced.