Authentic silk comes from the silkworm, a type of worm that weaves cocoons from the two silk glands located within its body. The cocoon measures about half of a mile on average.
Silkworm farms in Asia produce the bulk of silk, where there are thousands of these worms that form the half-mile cocoons on a regular basis. In addition to silkworms, spiders can produce silk. The silk that they produce is even stronger than that of silkworms. However, spiders produce a smaller quantity, which makes it difficult to accumulate the same amount as silkworms. Scientists are working to find a way to make a synthetic form of spider silk because of the strength of the fiber.