A natural material is a product that comes from a plant, animal or the ground and its physical properties are unchanged. Minerals and the metals that can be extracted from these materials with no further modification to their physical properties are also considered a natural material.
Examples of natural products are solid timber, wood veneer, bamboo, granite, sandstone and glass.

A manmade material is a product made up from any number of natural products available to us without any modification or change to any one of their physical properties.
Examples of manmade products are melamine boards, pvc wrap, paint finishes and laminates.

An engineered material is a product made for a specific use.
Material engineers modify and design materials to perform better than they otherwise would, with properties often exceeding those of natural materials. These materials are used to manufacture products having a high tensile strength with greater resistance to scratching, heat, chemicals and the elements.
Examples of engineered products are polyester and acrylic boards, engineered stone, sintered porcelain and corian.