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 provides enough space for one or two people to sleep comfortably, making it a popular choice for smaller bedrooms or guest rooms. Full beds are versatile and can accommodate various bedding styles, including sheets, comforters, and bedspreads. They are often used in teen rooms or by young adults transitioning to their own space, offering a balance between size and comfort without taking up too much room.