A mattress support is composed of three components: a SLAT, a BEDSTEAD, and a boxspring. A SLAT is a thin strip of wood or metal that provides a base for the mattress. A BEDSTEAD is a frame that holds the mattress and slats in place. Finally, a boxspring is a large rectangular box that provides additional support for the mattress. Together, these three components form a mattress support system that helps to ensure a comfortable night's sleep.