Plywood is a wood product manufactured out of many sheets of veneer,
or plies, presses together and glued,
with their grains going in opposite directions.
It tends to be extermely strong, though not very attractive,
and is treated in many different ways depending upon its intended application.
It is also referred to as an engineered wood,
although it is made from a composite of wooden materials,
and various forms of it have been made for thousands of years.