How many Generations of Computer

1st Generation of Computer – Vacuum tube based

Computer – First Generation:- The first generation period was from 1946–1959. First generation computers used vacuum tubes as basic components for memory and circuitry for CPUs (central processing units). These tubes, like electric bulbs, produced too much heat, and the installation often fuses.

2nd Generation of Computer – Transistor based

Second Generation:- The Second Generation Computer period was from year 1959-1965. A transistor computer, now often called a second generation computer, is a computer that uses discrete transistors instead of vacuum tubes. The first generation of electronic computers used vacuum tubes to generate large amounts of heat, they were heavy and unreliable.

3rd Generation of Computer – Integrated Circuit based

Third Generation:- The Third Generation Computer period was from year 1965-1971.Third generation computers used integrated circuits (IC) instead of transistors. A single IC consists of multiple transistors, resistors, and capacitors with associated circuitry. This development made computers small in size, reliable and efficient.

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4th Generation of Computer  – VLSI microprocessor Technology based

Fourth Generation:- The Fourth Generation Computer period was from year 1971-1980.Fourth generation computers used very large scale integrated (VLSI) circuits. The VLSI circuit consists of about 4999 transistors and other circuit elements with circuits connected on a single chip, making it possible to have a fourth generation microcomputer.