What is xdm in linux?
XDM ( X Display Manager) is the default display manager for the x window system . its a bare-bones x display manager. It was introduced with with x11 release 3 in october , 1988 to support the standalone x terminal that were just coming onto the market. It was written by Keith Packard.
Xdm provides services similar to those provided by init, getty and login on character terminals: prompting for login name and password, authenticating the user, and running a "session."
XDM provides a simple and straightforward graphical login prompt.
Source :
https://en.wikipedia.org/wiki/XDM_(display_manager)
https://wiki.archlinux.org/index.php/XDM
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