Hardtop vs Coupe vs Sedan

I hope I didnt f this up...

Ordered a headliner for our 69 Dart 340 Swinger. Took 4 weeks to get it. The website said it was for a 67-72 Dart COUPE. It was the only option available. It didnt say SEDAN, so my logic said it was correct. It is a PUI Interiors part number AH750100. I checked their website, and they dont say hardtop vs sedan vs coupe.

So the real question is... what the heck is a coupe?