| S.No. | Generations | Parts used | Feature | Examples |
| 1 | First Generation (1942-1955) | Electronic Vacuum Tubes | · Very Large and expensive · Produced a lot of heat and were slow · Used Machine Language to do work · Used Punched cards for storage | UNIVAC ENIAC IBM 701 |
| 2 | Second Generation (1956-1964) | Transistors | · Cheaper & more reliable · Produced lesser het and worked faster · Used High Level Language like FORTRAN and COBOL to work · Magnetic disk started being used for storage | IBM 7090 IBM 7094 ICL 1901 |
| 3 | Third Generation (1965-1975) | Integrated Circuits | · Small in size and less costly · Better reliability and speed · Used other languages like BASIC to do work | IBM 370 HP 2100 |
| 4 | Fourth Generation (1976 onwards) | LSI & VLSI Circuits | · Operating System concept started · Smaller, cheaper and worked faster and used a Microprocessor · Development in software to use User-Friendly Graphical Interfaced systems · Used Floppy Disks and other devices to store data | Personal Computers Like ICL 2900 HP 9845 |
| 5 | Fifth Generation | Micro-processors | · Accepts Instructions and Commands by voice · Interprets it on own to carry out the work | Super Computer |
Questions on Computer Generations
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