PAM (Pluggable Authentication Modules) is a flexible mechanism for authenticating users and managing authentication-related tasks in Unix-like operating systems.
PAM config files are typically stored in /etc/pam.d
PAM modules are typically stored in /lib64/security or /lib/security depending on the architecture.
PAM configuration files are text files that define how authentication should be handled for various services and applications
Each PAM configuration file corresponds to a specific service or application (e.g., login, sshd, sudo) and contains a series of rules that specify which PAM modules to use and how to use them.