Power BI developers use several strategies to ensure data security, including implementing role-based access control (RBAC) to restrict data visibility based on user roles. They configure row-level security (RLS), which allows them to limit the data that users can see based on their permissions. Additionally, developers leverage Microsoft’s built-in security features, such as Azure Active Directory integration, to manage user authentication and access. Data encryption both at rest and in transit further protects sensitive information, ensuring that only authorized personnel can view or manipulate the data presented in dashboards and reports.