Role-Based Access Control (RBAC) is a security mechanism that restricts system access to authorized users based on their roles within an organization. In this model, permissions are assigned to specific roles rather than individual users, making it easier to manage access rights. For example, an employee in the Finance department may have different access rights than someone in Human Resources. By using RBAC, organizations can ensure that users only have access to the information and resources necessary for their job functions. This helps protect sensitive data and reduces the risk of unauthorized access, enhancing overall security and compliance with regulations.