Medium Density Fibreboard (MDF)
Sources: -MDF is a type of hardboard, which is made from wood fibres bonded together with special adhesives while under heat and pressure.

Advantages
There are a number of reasons why MDF may be used instead of plywood or other materials. It is dense, flat, stiff, has no knots and is easily machined to high levels of accuracy. Because it is made up of fine particles it does not have an easily recognisable surface grain so MDF can be painted to produce a very smooth high quality surface. Because MDF has no grain it can be cut, drilled, machined and filed without damaging the surface.