Silk is a continuous strand of protein filament cemented together forming the cocoon of silkworm Bombyx mori. The silkworm forms silk by forcing two fine streams of thick liquid out of tiny openings in its head. On contact with air, the streams of liquid harden into filaments. Silk is classified as a natural, protein filament fiber.

   Silk classification depends on whether it comes from cultivated or wild silkworms. The cultivated silkworms, which solely live on mulberry leaves, produce the finest lustrous fibers, and these fibers are known as a real silk fiber. The wild silkworms which are not

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