What is a "Chord Progression?"

It's different than a chord sequence!

To me, at least, the key element of a chord progression is the word "progress." If the chords are merely a sequence, then they don't make progress, which is to say that they don't make sense. As I state in my book at amazon about chord progressions: (I'm gonna paraphrase myself here!) "Let's say you write down every chord there is on little sheets of paper and draw them one by one out of a hat.

Some would sound like they went together and some would not. Those that sounded like they went together would be chord 'progressions' and those that did not would be merely chord 'sequences.'" 

I go on and on to tell my readers what elements I have found that make up chord progressions.The most common is covered in the previous essay. There are others. People have been messing with  music for centuries now so this is reasonable.