Difference between DBus and other Interprocess Communications method

Question

When i studied about Linux interprocess Communications, i have known there were some method as: pipe, message queue, socket, signal, shared memory, semaphore and there is no method named Dbus.

But today, when i research about Dbus, i read that: "D-Bus is a system for interprocess communication (IPC)" (See that link: https://en.wikipedia.org/wiki/D-Bus)

So my question is: What is the different between DBus and other IPC methods?

Answer 1

There is no technical, but historical difference.

D-Bus didn't used to be a Linux (i.e. kernel) IPC, but an additional middleware IPC. But in the course of introduction of systemd, D-Bus became for several Linux distributions a part of the basic system.