OSB (Oriented Strand Board) is a type of engineered wood panel that is made by compressing and binding together strands of wood with a resin binder under high heat and pressure. The dimensions 2440x1220 refer to the length and width of the OSB sheet. OSB is a popular alternative to plywood and solid wood in construction, furniture-making, and other applications, due to its strength, durability, and cost-effectiveness. It is often used for flooring, walls, roofing, and sheathing, among other applications. The texture of OSB is rougher than plywood, with visible strands of wood on the surface. The strength and stiffness of OSB depend on the orientation of the strands, which are aligned in a specific pattern to maximize their mechanical properties.