libpam0g - 1.4.0-9+deb11u1 main

Contains the shared library for Linux-PAM, a library that enables the
local system administrator to choose how applications authenticate users.
In other words, without rewriting or recompiling a PAM-aware application,
it is possible to switch between the authentication mechanism(s) it uses.
One may entirely upgrade the local authentication system without touching
the applications themselves.