The history of computers can be told as a story of software and hardware, as a history of the internet, as a tale of smart technologies, or as a business history of major companies like IBM, Microsoft, Apple, Facebook, and Twitter. Computer historian Paul Ceruzzi offers a broader perspective in this concise and accessible account of the inventions and developments of digital technology. He identifies the four major developmental strands that run through the history of computers: digitization, the increase in computing power, the convergence of different technological developments, and human-machine interaction. Last but not least, he describes the revolutionary evolution from the room-filling minicomputer to the desktop PC and finally to the pocket-sized smartphone.