This document discusses the five generations of computers from 1940 to the present day. The first generation used vacuum tubes, took up entire rooms, and were expensive to operate. The second generation used transistors, which made computers smaller, faster, and more efficient. The third generation used integrated circuits, which further increased speed and efficiency. The fourth generation used microprocessors, which shrunk computers down to fit in the palm of a hand. The fifth generation, still being developed, uses artificial intelligence and parallel processing.