Sofa - sofas are typically larger and more formal than a couch. It often has a higher back and arms and is designed to seat multiple people comfortably. Couch - A couch is usually smaller and less formal than a sofa. It may have a lower back and arms and is designed to be more casual and comfortable. Couches are often associated with lounging and relaxation and may be used in living rooms, family rooms, or receptions. In general, both are the same the terms can be used in different ways depending on the context and the individual.