Fibres are thread-like structures with thin, long, and flexible strands that can be broadly defined. Plants and animals are the two main sources of fibres. The fibre manufacturing process, as well as the components and coating chemistries used in the process, determine the fibre qualities.
Fibre reinforcement is the primary source of structural characteristics in composite materials. The fibre in a composite, held in place by the matrix resin, gives tensile strength to the final product, improving performance attributes such as strength and stiffness while reducing weight.