Exterior plywood is a type of engineered wood made from thin layers, or veneers, of wood glued together. It is designed to withstand outdoor conditions, making it suitable for applications like siding, roofing, and outdoor furniture. The layers are arranged with their grains running in different directions, which enhances strength and stability. This plywood is treated with water-resistant adhesives and often has a protective finish to resist moisture and decay. It is available in various grades, with higher grades offering better appearance and durability. Exterior plywood is commonly used in construction and DIY projects due to its versatility and reliability.