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 adults with limited space, making it a popular choice for small bedrooms, guest rooms, or dormitories. Twin bed frames come in various styles and materials, including wood, metal, and upholstered options. They often feature slats or a solid base to hold the mattress securely. Some frames also include additional storage solutions, such as drawers or under-bed space, enhancing their functionality in compact living areas.