A twin size bed frame is designed to support a twin mattress, which typically measures 38 inches wide by 75 inches long. This size is ideal for children, teenagers, or small guest rooms, providing a compact sleeping solution that fits well in limited spaces. These bed frames come in various styles and materials, including wood, metal, and upholstered options. Many frames also feature additional storage solutions, such as drawers or under-bed space, making them practical for organizing belongings in smaller areas.