Role-Based Access Control (RBAC) is a security model that restricts system access to authorized users by grouping permissions into roles based on job functions and assigning these to users. This approach simplifies user management, reduces the risk of unauthorized access, and allows for dynamic adjustments in user roles and permissions as organizational roles change. RBAC examples across various industries include corporate IT systems, healthcare management systems, educational institution systems, financial services applications, e-commerce platforms, government agency systems, manufacturing control systems, and media and content management systems. Key best practices for implementing RBAC include adhering to the principle of least privilege, defining roles at an appropriate level of granularity, periodically reviewing user roles and access rights, separating roles governing different duties and areas of the system, monitoring activity, and automating provisioning.