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Creative coding is a type of computer programming in which the goal is to create something expressive instead of something functional.

Wikipedia

I kinda figured this out from context clues, but they really should introduce the term on this page!

Anyone know what "expressive" means here?

Also, you could have provided a link to the wikipedia article this is from.

Art. Creative coding is creating art, be that visual art or music.

Art is always left undefined. This is a feature, not a bug.