PCI DSS is the Payment Card Industry Data Security Standard, and this is a worldwide standard that was set up to help businesses process card payments securely and reduce card fraud. PCI DSS is intended to protect sensitive cardholder data.
PCI security standards are technical and operational requirements set by the PCI Security Standards Council and they apply to all organizations that store/manage/process/transmit sensitive data. If your organization opts for an hosted solution with tokenization functionality, then it must comply to all requirements but requirements 7 & 9.