Pure Data (aka Pd) is an open source visual programming language. Pd enables musicians, visual artists, performers, researchers, and developers to create software graphically, without writing lines of code.
Pd is a so-called data flow programming language, where software called patches are developed graphically. Algorithmic functions are represented by objects, placed on a screen called canvas. Objects are connected together with cords, and data flows from one object to another through this cords.