The answer to that question is a textbook, not a paragraph. But if you haven't any idea, then you haven't been paying attention. From TV ads to talk shows to sponsored online buzz to previews in theaters to movie merch to award shows to even word of mouth, and by all means it's not limited to just those things, we literally see movies being marketed constantly. And that's just the back end. There's the front end of it, marketing it to studios to be produced, marketing it to investors to be underwritten, marketing it to actors to appear in it, etc. And since marketing includes logistics, then there's marketing it to theaters to show it, marketing it to DVD producers and distributors, physical producing the actual reels of film, distributing it to theaters, etc. I mean, I'm not exaggerating when I say the answer to your extremely vague and extremely broad question is an entire textbook.