Role-Based Access Control (RBAC) is a method of limiting access to computer systems by assigning granular roles to users, allowing them to perform specific actions on defined resources. Kubernetes includes a robust RBAC implementation that can be used to segregate users in your cluster and restrict their access to just the necessary cluster resources. Key points include understanding the difference between RBAC and ABAC, knowing how to use Role, ClusterRole, RoleBinding, and ClusterRoleBinding objects, and following best practices for maintaining security and manageability of Kubernetes clusters.