Which language uses .pde extension

file-extensionprocessing

While searching for an implementation of the Barnsley's Fern fractal I came across a implementation that has .pde extension. Which programming language uses this extension?

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This code is from Processing.org an open source Java based IDE. You can find it Processing.org. The Arduino IDE also uses this extension, although they run on a hardware board.

EDIT - And yes it is C syntax, used mostly for art or live media presentations.

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