Plywood Made of wood panels from thin sheets of luan wood veneer. It is one of the most widely used wood products.
It is flexible, inexpensive, workable, and re-usable, and usually can be manufactured locally. Plywood is used instead of plain wood because of plywood's resistance to cracking, shrinkage, splitting, and twisting/warping, and because of its generally high strength.
Layers of thin woods, which are called Vaneers,are glued together, with adjacent plies having their wood grain at right angles to each other, to form a composite material. This alternation of the grain is called cross-graining and has several important benefits: Plywood Vaneers reduce the tendency of wood to split when nailed at the edges, this is a benefit for many do it yourself jobs, especially when you consider that most do it yourself'ers are novices in jobs for the first time.
Another benefit of Plywood Vaneers is that they reduce expansion and shrinkage, providing improved dimensional stability; and it makes the strength of the panel consistent across both directions.
There is usually an odd number of plies, so that the sheet is balanced—this reduces warping. Because plywood is bonded with grains running against one another and with an odd number of composite parts, it is very hard to bend it perpendicular to the grain direction.