Fiber yarn consists of transforming the (x) fiber into (y) yarn, this operation takes place when the different properties are utilized to obtain a desired result. This is done through addition of threads, when twisting several short fibers at once to bind them together and produce a continuous strand; when they are spun (twist) long filaments you get stronger threads, also called yarns.

The way the fibers are spun to produce yarn has a direct influence on the properties and appearance of the final product. The direction of spinning when producing yarn also influences the texture of the fabric.

Yarn with S torque or Z torque.

Natural fibers—except silk—are short; are processed to produce yarns with which fabrics will be manufactured. Nonwovens are produced directly from fiber. 'Chemical fibres', both artificial and synthetic, go through the yarn process during manufacture; this results in long, continuous filaments, which must be cut if they are to be mixed with natural fibers.

The yarn is done in several stages. The process of yarn manufacturing can be of two types: artisanal and industrial.