The French term for silk is 'soie', which is a four-letter word. Silk is a natural protein fiber that is produced by certain insects, such as the silkworm. It is one of the strongest natural fibers and is often used to make clothing, bedding, and other fabrics. Silk is also used in the production of carpets, upholstery, and other textiles. Silk has been used for centuries and is still popular today due to its luxurious feel and appearance.