First generation computers (1942-1955) used vacuum tubes to process data. Some computers of this generation were ENIAC, EDVAC and EDSAL. These computers were very Second generation computers (1956 – 1964) used transistors. Transistors were smaller and more reliable then vacuum Tubes. These computers were smaller, faster, cheaper and more reliable than first generation computers. Computers became smaller, portable, faster and cheaper. They also needed less power than Third generations computers (1965-1975) used integrated circuits. Fourth generation computers use microprocessors. A microprocessor or microchip is a tiny water of silicon. Microchips are widely used in video games, pocket calculators, cash registers, washing machines and other devices. make decision on their own and understand things in the same way as human beings. Fifth generation computers are based on artificial intelligence. They can the data processing cycle describes how data is processed into information by the computer.