Plywood is a sheet material manufactured from thin layers or "plies" of wood veneer that are glued together with adjacent layers having their wood grain rotated up to 90 degrees to one another. This cross-grained configuration greatly improves the dimensional stability and reduces shrinking, swelling and twisting. Most plywoods consist of an odd number of plies so that the sheet balan... https://logcla.com/blogs/498322/Plywood-A-Highly-Versatile-and-Popular-Laminated-Wood-Material