I want to know the answer to the following question:
What widely-used product is almost always made of wood fibers?
All the background I'm provided with is that "Wood unsuitable for construction in its native form may be broken down mechanically (into fibers or chips) or chemically (into cellulose) and used as a raw material for other building materials, such as engineered wood, as well as chipboard, hardboard, and medium-density fiberboard (MDF).". Is that enough to answer the question?
Answer: no