What is computer?
A computer is an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program
Computer - Generations
1
The period of first generation: 1946-1959. Vacuum tube based.
2
The period of second generation: 1959-1965. Transistor based.
3
The period of third generation: 1965-1971. Integrated Circuit based.
4
The period of fourth generation: 1971-1980. VLSI microprocessor based.
5
The period of fifth generation: 1980-onwards. ULSI microprocessor based.