Processing is an open source programming language and environment for people who want to create images, animations, and interactions. Initially developed to serve as a software sketchbook and to teach fundamentals of computer programming within a visual context, Processing also has evolved into a tool for generating finished professional work. Today, there are tens of thousands of students, artists, designers, researchers, and hobbyists who use Processing for learning, prototyping, and production.
For now we recommend visiting the official processing website for a quick introduction to the basics of processing: Processing Tutorials.
To get inspired, check out this website from the Graduate school of architecture, planning and preservation from Columbia Univeristy: