Silk (biological material)

Silk is a natural fiber produced by certain insects, primarily silkworms, as they spin cocoons to protect their pupal stage. These insects secrete a fluid that hardens into a continuous thread, which they weave into their protective cocoon. Silk fibers are composed mainly of proteins called fibroin and sericin, giving it strength, smoothness, and a lustrous appearance. Historically valued for its beauty and durability, silk has been used in textiles for thousands of years. Its unique combination of strength, softness, and shine makes it a highly prized material in clothing and luxury fabrics.