What is the difference between Plywood & Oriented Strand Board (OSB)?

Plywood and OSB are made differently. Oriented strand board is made from hear-cured adhesives and wood particles that are arranged in layers that cross. Plywood is constructed from thin sheets of veneer, which are thin layers of wood peeled from a log. In plywood, the sheets are cross-laminated and glued together using a hot press. Due to these construction differences, plywood appears much more smooth and consistent than OSB. but the finished products are very similar in strength and performance characteristics. OSB is considerably less expensive than plywood. Many consider OSB to be a "green" material because the boards are constructed from smaller trees, like poplars.