The Japanese are the ones who started the futon bedding system. Actually, they used the word “shikibuton”, meaning mattress; it was the Americans who named it a futon. Unlike the Japanese, the American concept included the mattress, the convertible furniture it sits on, or both.
Basically, a futon acts as a sofa during the day and is converted into a sleeping space at night. Some of the futons have wooden frames that can be folded and put away to save space.