Kubernetes Role-Based Access Control (RBAC) is a built-in feature that allows admins to assign permissions to users and workloads based on their roles. It provides granular access control, improves security by limiting unnecessary privileges, and enables access auditing. RBAC relies on "verbs" to define specific permissions associated with roles, such as get, create, or delete. It also supports aggregated ClusterRoles, user accounts vs. service accounts, role and clusterrole bindings, namespaced vs. non-namespaced Roles, common RBAC misconfigurations, challenges in managing RBAC, and best practices for using RBAC effectively. To troubleshoot issues with RBAC, admins need to assess whether the problem is specific to certain roles or clusterroles, review API server logs, and use third-party tools for auditing and monitoring. By following best practices, such as keeping Roles granular, enforcing least privilege, minimizing wildcard use, reviewing and removing unused Roles, and managing RBAC policies using Infrastructure-as-Code (IaC), admins can maximize the effectiveness of RBAC in Kubernetes.