Generation of computer

	First Generation The period of first generation: 1946-1959. Vacuum tube based.
	Second Generation The period of second generation: 1959-1965. Transistor based.
	Third Generation The period of third generation: 1965-1971. Integrated Circuit based.
	Fourth Generation The period of fourth generation: 1971-1980. VLSI microprocessor based.
	Fifth Generation The period of fifth generation: 1980-onwards. ULSI microprocessor based