We use electronics, such as smartphones, tablets, and TVs, every day. This comprehensive guide outlines the development of electronics, from early vacuum tubes to today's microchips. It explains how semiconductors work at the atomic level and how they are made into solid-state devices essential for the internet and other applications. Science projects readers can try at home illustrate principles of physics, and readers discover biographical information about pioneers of electronics. This new edition has been meticulously updated to provide new information for readers with an interest in technology.