GDM
GDM, short for GNOME Display Manager, is the display manager used by the GNOME desktop environment. A display manager is the component responsible for handling graphical logins, starting user sessions, and managing access to the graphical server. GDM runs as a system daemon and coordinates with the display server (X11 or Wayland) to present a login screen and to initiate a user session after successful authentication.
The login screen, or greeter, presents available user accounts, accepts credentials, and offers a session selector
GDM is commonly packaged as gdm or gdm3, depending on the distribution. It is typically controlled by
Despite its GNOME focus, GDM can be used with other desktop environments, although it is optimized for