Linux PAM

Linux PAM (Pluggable Authentication Modules) is a flexible framework that manages how users log into a Linux system. It allows system administrators to control authentication methods—such as passwords, fingerprint scans, or security tokens—through modular components called modules. These modules can be added, removed, or customized without altering the core system, making authentication processes adaptable to different security needs. In essence, PAM acts as a centralized hub that simplifies, standardizes, and enhances the security of user login procedures across various services and applications on a Linux system.