For Talend ESB, it is used to manage users and groups within the ESB Runtime Environment. So, Talend Identity and Access Management is mandatory to use authentication and authorization with Talend ESB, especially as authorization is only supported in combination with the Talend Identity and Access Management.
This product module is only available with the Talend subscription versions of the Talend ESB; it is not included in the Talend Open Studio for ESB.
For Talend Open Studio for ESB, the JAAS Login module is still used by default to handle authentication via the SAML Token (as in the previous versions).
So the users of Talend subscription products need to be created and maintained in the Talend Identity and Access Management to be authenticated and authorized to access your company's ESB resources, however, the use of the JAAS Login module is still possible in the Security Token Service (instead of the default Talend Identity and Access Management). For more information on how to use JAAS Login module instead of Talend Identity and Access Management as authentication handler in the Security Token Service, see JAAS scope.
For information about the installation of Talend Identity and Access Management, see Installing Talend Identity and Access Management.