Cords

Cords are slender, flexible lengths of material used to tie, pull, secure, or transmit force. They can be simple strings or thicker lines and may carry electrical power or signals when insulated. The term also appears in anatomy, where several tubular structures are called cords, such as the vocal cords in the larynx, the spinal cord within the vertebral column, and the umbilical cord linking a fetus to the placenta.

Common varieties include clothing drawstrings, shoelaces, and other cords used for fastening; braided or twisted cords used for light to moderate load bearing; and electrical cords that consist of conductors insulated inside a flexible jacket. In biology, multiple cords appear, including the vocal cords, the spinal cord, the umbilical cord, and other cord-like structures that serve transport or signaling roles.

Materials and construction: cords are made from natural fibers such as cotton, hemp, jute, and silk, or synthetic fibers like nylon, polyester, polypropylene, and aramids. Some cords incorporate a core for strength and an outer sheath for protection. Construction methods include twisting, braiding, and plaiting, producing cords with varying stiffness, elasticity, and abrasion resistance.

Care and safety: care depends on type. Natural fiber cords may absorb moisture and wear with use, while electrical cords require proper insulation, appropriate gauge, and compliance with safety standards. Inspect cords regularly for fraying, cuts, or heat damage, and replace if compromised. Store cords coiled or hung to prevent tangling and to maintain longevity.