The primary ingredient in silk is a protein called fibroin, produced by certain insects, most notably the silkworm (Bombyx mori). Silkworms spin their cocoons from this protein, which is then harvested to create silk fabric. The process begins with the cultivation of mulberry trees, which are the main food source for the silkworms. After harvesting the cocoons, the fibroin is extracted and spun into threads, yielding a luxurious, smooth fabric that has been prized for thousands of years for its sheen, elegance, and durability. Silk has significant cultural and economic importance worldwide.