Aren't they the same thing?
The difference? Where you live and which one you learned. It's as simple as that.
A couch is very similar to a sofa. Derived from Middle French, couche, a couch is an article of furniture for sitting or reclining. Sofa, taken from the Arabic suffah, is a long upholstered seat usually with arms and a back. A settee is a long seat with a back or a medium-sized sofa. Scandinavian in origin, a squab is another name for a couch or a stuffed cushion. A chaise lounge, French in origin, is a long reclining chair.
