The document outlines the five generations of computers from the 1940s to present day. The first generation used vacuum tubes from 1940-1956 with the ENIAC being the first computer. The second generation used transistors from 1956-1963. The third generation used integrated circuits from 1964-1971. The fourth generation began in 1971 and uses microprocessors. The fifth generation involves artificial intelligence and is the present and beyond.