Spider silk is a strong, flexible material produced by spiders for various purposes, such as building webs, wrapping prey, and creating egg sacs. It is made of proteins and can stretch up to five times its length without breaking, making it one of the strongest natural fibers known. There are several types of spider silk, each serving different functions. For example, orb-weaver spiders produce silk for web construction, while tangle-web spiders use it to trap insects. Scientists study spider silk for potential applications in medicine, textiles, and engineering due to its unique properties.