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Yarn is a long continuous length of interlocked fibres, suitable for use in the production of textiles, sewing, crocheting, knitting, weaving, embroidery, or ropemaking. It can be made of a number of natural or synthetic materials, and comes in a variety of colors and thicknesses (referred to as "weights").

Yarns are made from both natural and synthetic fibre, in filament or staple form. Filament is fibre of great length, including the natural fibre silk and the synthetic fibres. Most fibres that occur in nature are of fairly short length, or staple, and synthetic fibres may be cut into short, uniform lengths to form staple.

Spinning is the process of drawing out and imparting twist to a mass of fibres. Filament yarns generally require less twist than staple. A fairly high degree of twist produces strong yarn; low twist produces softer, more lustrous yarn; and tight twist produces crepe yarns. Two or more single strands of yarn may be twisted together, forming ply yarn.

Novelty yarns, used to produce special effects, include boucl�©, characterized by projecting loops; nub yarn, with enlarged places, or nubs, produced by twisting one end of a yarn around another many times at one point; and chenille, a soft, lofty yarn with pile protruding on all sides. Textured yarns are synthetic filament yarns that are made bulky or stretchy by heating or other techniques.

In yarns used for weaving, the warp, or lengthwise, yarns are usually made stronger, more tightly twisted, smoother, and more even than the filling, or crosswise, yarns. Knitting yarns have less twist than weaving yarns. Yarns used for machine knitting may be single or ply types; ply yarns are generally used for hand knitting. Thread, used for sewing, is a tightly twisted ply yarn having a circular cross section.