The most common trending door materials today are MDF, veneered wood, fiberglass, and steel. Each material is used for different purposes in construction. MDF doors are affordable and smooth, making them a popular choice for interior painted doors. Veneered doors have a natural wood look while keeping better stability and lower cost than solid wood. Fiberglass doors are strong, weather-resistant, and energy efficient, which makes them suitable for exterior entry doors. Steel doors provide high security, durability, and fire resistance, so they are often used in commercial buildings and secure areas.