Fiber internet is carried through a bundle of thin, lightweight optic fibers via modulated light. As thin as human hairs, these strands of optically pure glass can carry digital information over impressively long distances. But because fiber cables are not as prevalent as cable TV lines, the process of installing fiber-optic cable internet can be more intrusive and take a bit longer than installing cable. Fiber is usually installed by a professional, yet some providers offer a self-installation option