Backcountry camping: a flat spot, a firepit ring, a covered latrine pit with a park service logo on it, and a cable on a pulley for your bear bag. The extent of your site might be represented by a dot at a place on your topo map that slightly differs from reality.
Some tent campgrounds also offer wi-fi and limited electrical power distribution.
There are a number of parks (including most US national parks) that only allow backcountry camping at designated sites (which may or may not have the amenities described by the GP).
1. Building Rental (Cabin, etc.)
2. RV / Camper
3. Park and Camp (Tent)
4. Hike and Camp (Tent)
With #3 you park in a nearby lot and walk to a designated camp site, often times with things like tent pads, benches, tables, grilling areas, etc., roughly a mile or so from the parking lot, usually closer than not. With #4 this is non-trivial hiking and camping in proper wilderness. Sometimes they will have designated camping sites, sometimes it's completely up to you.
I would assume "Tent" is just #3 and "Backcountry" is #4.
That said, we did have one trip that ended up being "dutch oven backpacking", because the road to the campsite was blocked and we had to lug all of the gear, including the cast iron dutch ovens, the mile or so by hand instead.
http://npshistory.com/publications/wilderness/white-papers/4...