Plywood is a type of engineered wood made from thin layers, or "plies," of wood veneer that are glued together. The grains of each layer are typically oriented in different directions, which enhances the strength and stability of the material. Plywood is commonly used in construction, furniture making, and various DIY projects due to its versatility and durability. There are different grades and types of plywood, including marine plywood, which is designed for use in wet environments, and exterior plywood, which is treated to resist moisture. Plywood can be cut, shaped, and finished easily, making it a popular choice for both professional builders and hobbyists.