The CSA STAR (Cloud Security Alliance Security, Trust & Assurance Registry) is a program designed to help organizations assess the security of cloud service providers. It offers a framework for evaluating the security practices of cloud services, ensuring transparency and trust between providers and customers. The CSA STAR program includes three levels of assurance: self-assessment, third-party assessment, and continuous monitoring. This tiered approach allows organizations to choose the level of scrutiny that fits their needs, promoting best practices in cloud security and helping to mitigate risks associated with cloud computing.