All fibers which come from natural sources (animals, plants, etc.) and do not require fiber formation or reformation are classed as natural fibers. The natural fibers are vegetable, animal, or mineral in origin. Some of the natural fibers like vegetable fibers are obtained from the various parts of the plants. They are provided by nature in ready-made form. It includes the protein fibers such as wool and silk, the cellulose fibers such as cotton and linen, and the mineral fiber asbestos.