A daybed frame is quite different from that of a standard bed. Daybed frames usually are comprised of two arms and a back, imitating the basic structure of a sofa. There are two common types of frames; the link spring, and the platform. The link spring frame is a metal grid that acts as a box spring, and is attached to the frame to support the mattress. There is usually a gap between the frame and mattress to allow for bedding and making the bed. As for the Platform-style frame, the mattress is supported by either a Bunkie board or a slat rack. A Bunkie board, resembling a box spring without the coil work but thinner, fits inside the frame and is designed to support the mattress evenly.