Spider silk is a natural fiber produced by spiders, known for its remarkable strength and elasticity. It is made of proteins and can be spun into threads that are finer than human hair. Different species of spiders produce various types of silk, each serving unique purposes, such as building webs, wrapping prey, or creating egg sacs. The structure of spider silk allows it to absorb energy, making it tougher than steel while remaining lightweight. Researchers are studying spider silk for potential applications in medicine, textiles, and engineering, aiming to replicate its properties for use in products like sutures and bulletproof clothing.