In how many generations a computer can be classified?

There is 5 generation of computer available till now.

1^st Generation of Computer = The period of first generation: 1946-1959. Vacuum tube based.

2^nd Generation of Computer = The period of second generation: 1959-1965. Transistor based.

3^rd Generation of Computer = The period of third generation: 1965-1971. Integrated Circuit based.

4^th Generation of Computer = The period of fourth generation: 1971-1980. VLSI microprocessor based.

5^th Generation of Computer = The period of fifth generation: 1980-onwards. ULSI microprocessor based.