PD Stands for Pure Data Programming Language i.e is a visual programming language which is used for creating interactive computer music and multimedia works. It is a open source software which can run on GNU/Linux, Mac OS X, iOS, Android and Windows.
Pd is used by the musicians, visual artists, performers, researchers and developers to create software graphically, without writing lines of code. It is used to process or generate music, 2D/3D graphics, vedio and interface sensors.
Example of Pure Data Programming Language