Generation in computer terminology is a change in technology a computer is/was being used. Initially, the generation term was used to distinguish between varying hardware technologies. But nowadays, generation includes both hardware and software, which together make up an entire computer system.
There are totally five computer generations known till date. Each generation has been discussed in detail along with their time period and characteristics. Here approximate dates against each generations have been mentioned which are normally accepted.
Following are the main five generations of computers
| S.N. | Generation & Description |
| 1 | First GenerationThe period of first generation: 1946-1959. Vacuum tube based. |
| 2 | Second GenerationThe period of second generation: 1959-1965. Transistor based. |
| 3 | Third GenerationThe period of third generation: 1965-1971. Integrated Circuit based. |
| 4 | Fourth GenerationThe period of fourth generation: 1971-1980. VLSI microprocessor based. |
| 5 | Fifth GenerationThe period of fifth generation: 1980-onwards. ULSI microprocessor based |
