This document provides an overview of semiconductors and their evolution and applications. It discusses how early electronics used inefficient vacuum tubes, which were replaced by diodes and transistors in the 1940s-1950s that could control electrical current flow. Integrated circuits with millions of transistors then emerged in the 1960s, making devices smaller and more reliable. The semiconductor industry is now a $298 billion industry led by companies like Intel, Samsung, and Toshiba. Semiconductors are crucial components in computers, networking, automobiles, gaming systems, and GPS technology. The future remains focused on developing smarter, faster, and less expensive semiconductors.