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Plywood is a type of engineered wood product that is constructed by bonding together multiple layers of thin wood veneers, also known as plies. These veneers are typically arranged with their grain running in alternating directions, which enhances the strength and stability of the panel. This perpendicular grain orientation reduces the likelihood of warping and splitting, making plywood a versatile and durable material for various construction applications.

The bonding process often involves the use of adhesives under heat and pressure, which ensures that the layers adhere firmly to one another. The number of layers can vary, but more layers generally result in greater strength and resistance to damage. This unique construction method allows plywood to be used in a wide range of applications including flooring, walls, roofs, and furniture.

The other options don't accurately describe plywood; a single layer of solid wood does not provide the benefits of stability that multiple layers do, while composite flooring and synthetic boards refer to different types of materials that do not involve the layering process characteristic of plywood.