Fiber-optic internet is the fastest residential internet technology available. Over 200 fiber internet providers exist in the United States and fortunately for you, fiber is going to be available to you. Fiber internet works using fiber-optic lines, which are cables that contain strands of glass. The glass acts as a conduit for flashing lights that blink at designated intervals to relay digital code from one end to the other. This technology allows for internet speeds far beyond what you get from DSL or cable.