Fiber optics are long, thin strands of very pure glass about the thickness of human hair. These fibers diameter slightly thicker than that of a human hair and grouped together in cables to send data at the speed of light. Note that in some countries, including the UK, fiber optics is spelled "fibre optics. Fiber optic transmission systems are superior to metallic. Fiber optic cables, which are bundles of optical fibers capable of transmitting information at the speed of light across great distances, are an often-unseen technology that is critical to the functioning of the modern world. This method allows high-speed data transmission over long distances with minimal loss, making it essential for modern data networks, telecommunications, and the internet.