MDF stands for Medium Density Fiberboard. It is a type of composite wood product made by breaking down hardwood or softwood residuals into wood fibers, combining it with wax and a resin binder, and forming it into sheets under high pressure and heat. MDF is commonly used in the manufacturing of furniture, shelving, and cabinetry, as well as in construction as a substrate for flooring, doors, and paneling. It is known for its uniform density, smooth surface, and ability to be shaped and cut easily, making it a popular choice for a variety of applications. MDF is also often used as a substitute for solid wood, as it is less expensive and more stable, but it is not as strong or durable as solid wood and is not suitable for outdoor use.