What is plies-definition?

Plies are thin layers of material that are stacked on top of one another to make a stronger, more durable material. Plies are most commonly made from textiles, such as cotton or polyester, but can also be made from other materials, such as paper or metal. The number of plies used in a material can vary depending on the desired strength and thickness of the final product. Plywood, for example, is made by stacking multiple layers of wood veneer on top of one another and bonding them together with adhesives. Plies are also used in the manufacturing of tires, where layers of rubber and steel cords are stacked to create a durable and long-lasting tire.