A couch or sofa is a piece of furniture for seating two or more persons in the form of a bench, with or without armrests, that is partly or wholly upholstered, and often fitted with springs and tailored cushions. Although a couch is used primarily for seating, it may be used for reclining.
In homes, couches are normally found in the family room, living room, den, sitting room or the lounge. They are also found in hotels, lobbies of commercial offices, waiting rooms, furniture stores, etc.
The term 'couch' is used in North America, Australia, New Zealand, whilst the term 'sofa' is generally used in the United Kingdom and Ireland. The word originated in Middle English from the Old French noun couche, which derived from the verb meaning 'to lie down'. It originally denoted an item of furniture for lying or sleeping on, somewhat like a chaise longue, but now refers to sofas in general.
Other terms synonymous with the above definition of couch are sofa, settee, chesterfield, divan, davenport, and canapé. The word sofa is from Turkish derived from the Arabic word suffa for 'carpet' or 'divan', originating in the Aramaic word sippa for 'mat'. The word settee comes from the Old English word, 'setl', which was used to describe long benches with high backs and arms, but is now generally used to describe upholstered seating.
The most common types of couches are the loveseat, designed for seating two persons, and the sofa, with two or more cushion seats. A sectional sofa, often just referred to as a "sectional", is formed from multiple sections (typically two, three and four) and usually includes at least two pieces that join at an angle of 90 degrees or slightly greater, used to wrap around walls or other furniture.