Board is a long, flat, usually rectangular sheet of rigid or semi-rigid composite material for making boxes or cartons. Types differing in composition and thickness — cardboard, paperboard, fibreboard — it is the structural backbone of food packaging. In food use, board must be food-grade, free of harmful mineral oils and contaminants from recycled fibres, with functional barriers where it contacts fatty or moist foods. It provides structural protection and a printable surface for labelling, branding, and mandatory information, and its recyclability supports packaging sustainability goals when properly separated from food residues.