Missing a brief overview of how it works and a short demonstration

[StefanL38]

You might not believe it:

Today is the first day that I have read about processing. So I looked up the homepage.

Lot's of information but nowhere I could find a still brief description that goes beyond

"Interactive programs with 2D, 3D, PDF, or SVG output"

aha. --- .. --- ... --- ... and how is it "processed"?????

Do I click drag and drop graphical objects that represent computing commands? Do I write a programtext? similar to which programming language?

Where can I find a graphic that gives on overview about the main elements used by processing?

The homepage suffers from "experts blindness to beginners diffculties"