It is a textile fiber produced from the secretions of some Lepidoptera, more specifically the result of the secretion of the seritter gland. Silk is made up of the filament produced during the manufacturing of the cocoon, in which the silkworms enclose themselves to complete the transformation from silkworm to butterfly (metamorphosis).
Silk is generally divided into cultivated silk, if obtained from the cocoon of the common silkworm, and wild silk, native or tussah, if produced by living silkworms in a free or semi-free state.