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Popup Campers go by several names in the camping world.  Whether you are looking for a popup camper, folding trailer, tent camper, or fold down trailer, or folding camping trailer, they are all the same type of camping unit which is a box style camper with a lift system (hand crank or powered hydraulic) that raises the sides which are usually partly canvas and partly hard materials, and which have canvas enclosed sleeping areas that slide out from either end of the camper. 

A few models of popup campers have hard sides, which means the only portion of them that is soft sided (canvas material) is the sleeping areas.  There are also some hybrid models such as Hi-Lo and Trail Manor that are consist completely of hard materials and no canvas but that still raise and lower much like a typical popup camper.  And, there are also models that look just like a travel trailer, but have one or more canvas slide-out sleeping areas that increase the interior living space while helping keep the weight of the trailer as low as possible.