What is a Chair?
A chair is a raised surface for sitting purpose. It is generally used by one person. The raised sitting surface is supported by four legs. A chair usually has arms and a backrest. Sometimes it has a footrest too- like in recliners. Chairs may sometimes have extended back that goes above the height of the occupant's head and can be called a headrest- like those on barber's chair. When the seat of chair is made in such a way that more than one person can sit on it, then it can be called a Sofa, couch, bench or a love seat.
Wooden Rocking Chairs
A rocking chair, also called a rocker, is a wooden side chair or armchair having legs mounted on curved rockers. This makes the wooden chair sway back and forth. A rocking chair can be on springs or on a platform- the platform rocker- in order to avoid crushing anything that gets under the rocker.