This document defines several key terms related to textiles, including fibres, yarns, and fabrics. It explains that fibres are the smallest visible unit that can come from natural or man-made sources and are spun into yarns. Yarns are long continuous lengths made by interlocking fibres through spinning. Fabrics are made by weaving, felting, or knitting yarns into cloth. The document also distinguishes between natural, cellulosic, protein, and regenerated fibres as well as single, ply, and cable yarns.