This article deals with the physical technology that makes the digital world possible. It looks routers, networks, undersea cables, data centers, and cell towers. It also contains text boxes on ARPANET, satellite based internet, and fiber optic cable. This text will help students understand the engineering necessary to make the modern world work. This product contains differentiated versions of the same reading: level 1 has a word count of 889 and a Flesch-Kincaid reading ease score of 61.3.Le