Documentaries v. Everything else.

I've been wondering what makes a documentary different to watch, in a cinematic way, than, say, a dramatic TV series. Is a different type of film/camera used to film a documentary, or is it a matter of timing/lighting/sound? I'm sure there's a cinema student out here who knows the answer. :D

Edit: To clarify, as I said in a comment to redcoast, what I meant was the way the subjects move, for example. Not the direction per se, but the actual movement itself--a nod in a documentary seems more fluid, faster than a nod in a movie. I know that movies are scripted and controlled, but the physical appearance of movement seems like something the camera might be a part of. Hopefully this will be less confusing... sorry! :D