Role hierarchy in CRM refers to the structured assignment of user roles and access permissions based on organizational structure. It ensures employees have appropriate access levels to customer data, workflows, and reporting features according to their job responsibilities. Role hierarchies enhance security, streamline workflow management, and prevent unauthorized data access. Businesses use role-based access control (RBAC) to maintain compliance, reduce security risks, and improve operational efficiency. Implementing a well-defined role hierarchy in CRM helps organizations manage teams effectively while safeguarding sensitive customer information.