Futons beds have been popularly used in Japan where it has originated. But today futons are commonly used by people all over the world. There variations in futon bed as in eastern side futons are also used for seating purpose. When bed is not in use the futon mattress which is thin little more than a pad can be rolled up to make a couch.
While in western countries futon is refers to a particular type of sofa-bed. It usually consists of a wooden or metal frame and a thin mattress with a cover. The frame can be used as couch or sofa in the day time and sleeping sofa at night.