Yarn is a kind of textile, processed into a certain fineness product with various textile fibers, used for weaving, rope making, thread making, knitting and embroidery, etc. It is divided into short fiber yarn, continuous filament and so on.
There are many ways to express the fineness of yarn, such as number, metric count, imperial count, denier, etc. (see count). The twist of the yarn is expressed in the number of turns per meter or inch.
Wool yarn and wool are generally used for spinning woolen sweaters, woolen pants, woolen vests, scarves, hats and gloves, and knitting various spring and autumn clothing items. In addition to keeping warm, they also have decorative functions.