Fiber acts as a guide for light waves. Fiber is low-cost and flexible, and so much of it is already in place. It can carry up to 20 Tbps over thousands of kilometers/miles without boosting signals and without interference. It is a long-haul data highway that gets information from A to B, undersea, across continents, and these days, it’s even available to have a private fiber network. Despite the excitement over wireless, wired is not going anywhere soon. It’s just too valuable and there is already so much of it in place.