RBAC is an approach to managing access rights within a system by assigning permissions to specific roles rather than individual users. In Kubernetes, RBAC allows you to define fine-grained permissions for users and service accounts, specifying which resources they can access and what actions they can perform on those resources. Implementing RBAC in Kubernetes is crucial for maintaining a secure and efficient environment, as it securely limits access to resources based on the roles assigned to users or service accounts, reduces the risk of unauthorized access and data breaches, and helps organizations meet compliance requirements. By following best practices such as regularly reviewing and updating roles and permissions, using namespaces to isolate resources, and thoroughly testing RBAC policies, organizations can implement granular access control policies that ensure users have the necessary permissions to perform their tasks while following the principle of least privilege.