Nylon 6 is a semicrystalline thermoplastic polymer synthesized from caprolactam via ring-opening polymerization. It has high tensile strength, elasticity, and resistance to abrasion and chemicals. Common applications include fibers, ropes, bristles, gears, bearings, surgical sutures, and more. Nylon degrades slowly and is used for banners, flags, clothing like jackets, and other outdoor materials due to its durability against UV light and weathering.