Cardboards are rigid construction materials made from one or more layers of paper bonded together. They are primarily used for making packaging, boxes, corrugated boards, presentation sheets, and other similar products. Cardboards can be made from different types of paper and come in various thicknesses and strengths, depending on their specific use. They are valued for their rigidity and durability, and are used in various industries and applications, such as product packaging and transportation, advertising, display, and more.