Nylon is a very strong man made polymer used in different forms. This is a great material to print parts with the need to withstand a lot of stress or outside effects. Nylon can also be used to print sliding or turning parts as its self lubricating.
The printing and chemical properties are better than ABS, although the bonding to the print bed is weaker which means that prints are prone to warping.
Nylon is used as a fiber in clothing, in films for food packaging and in shapes for injection molded parts. Injection molded parts made out of Nylon are very strong, stronger than its ABS counterparts.