What are the key differences between plywood and veneer, and how do these differences impact their suitability for various woodworking projects?

Plywood is made by layering thin sheets of wood together, while veneer is a thin layer of wood glued onto a substrate. Plywood is stronger and more durable than veneer, making it suitable for structural projects. Veneer is more decorative and better for furniture and cabinetry where appearance is important.