Medium-density fibreboard (MDF or MDFB) is an engineered wood product formed by breaking down softwood into wood fibers, often in a defibrator, combining it with wax and a resin binder, and forming panels by applying high temperature and pressure.
It is made up of separated fibers, (not wood veneers) but can be used as a building material similar in application to plywood. It is much more dense than normal particle board.
The name derives from the distinction in densities of fiberboard. MDF is also known as Customwood or Craftwood. Large-scale production of MDF began in the 1980s.