The name of the PAM service
The PAM service name identifies the PAM module.
This PAM module typically is located in the /usr/lib/security directory and its parameters are listed in the /etc/pam.conf file.
In Linux™, the /etc/pam.conf file can be replaced with a directory called /etc/pam.d, where there is a file for each PAM service. If /etc/pam.d exists, /etc/pam.conf is ignored by Linux. See the system documentation for the details of this configuration file.