What is "d-bus"

In computing, D-Bus or DBus is an inter-process communication (IPC) and remote procedure call (RPC) mechanism that allows communication between multiple computer programs (that is, processes) concurrently running on the same machine. D-Bus was developed as part of the freedesktop.org project, initiated by Havoc Pennington from Red Hat to standardize services provided by Linux desktop environments such as GNOME and KDE.

The freedesktop.org project also developed a free and open-source software library called libdbus, as a reference implementation of the specification. This library is often confused with the D-Bus itself. Other implementations of the D-Bus client library also exist, such as GDBus (GNOME), QtDBus ( Qt/KDE), dbus-java and sd-bus (part of systemd).