A "full bed," also known as a double bed, is a type of mattress and bed frame that measures 54 inches wide by 75 inches long. It is larger than a twin bed but smaller than a queen bed, making it a popular choice for single sleepers who want extra space or for couples who don't mind sleeping close together. Full beds are commonly used in smaller bedrooms, guest rooms, and apartments due to their compact size. They can accommodate one or two people comfortably, and various bedding options, such as sheets and comforters, are available specifically designed for this size.