This chapter describes the evolution of the technologies leading to the digital. This includes the timeline showing when various new technologies, systems, and services were implemented. This evolution would not have been possible without the invention of the transistor and the following evolution of microelectronics. A key invention includes the World Wide Web, which popularized the Internet. Another key invention is the smartphone, which fueled the mobile revolution. The drive has been faster and faster processing and larger and larger data stores. The next step in this evolution is to utilize the full capacities of the Internet of Things.