Plywood is an engineered wood product made by gluing together thin layers of wood veneer, with the grain of each layer rotated for strength and stability. It is widely used in construction, furniture, and cabinetry due to its durability and resistance to warping. Plywood comes in hardwood and softwood varieties, with grades ranging from A (high quality) to D (lower quality). It is favored for its strength-to-weight ratio and versatility, though it can be more expensive than alternatives like particleboard. Common applications include flooring, roofing, and wall panels.