The Generations of Computers are following :
1. The First Generation : 1946 to 1958
The First Generations computers were huge, slow, expensive and often undependable and used 'Vaccum Tubes' in CPU's.
2. The Second Generation : 1959 to 1964
Transisters replaced vaccum tubes and unhered in the second generations of computes.
3. The Third Generation : 1965 to 1970
Integrated Circuits (IC) are introduced that have started replacing transistors.
4. The Fourth Generation : 1971 to 1989
This generation can be characterized by both the jump to monolithic integrated circuits (millions of transistors put onto one integrated circuit chip) and the invention of the microprocessor.
5. The Fifth Generation : 1990 to Present
Fifth generation computing devices, based on artificial intelligence, are still development, there are some applications, such as voice recognition, that are being used today.