A computer is a electronic device
What is a computer?
What are the parts of a computer?
What is the history of a computer?
The first generation of computers were made from the 1940's to the 1950's. It used thousands of vacuum tubes, crystal diodes, relays, resistors, and capacitors.
The second generation of computers were made from 1955 to 1960. Transistor computers consumed far less power, produced far less heat but were much smaller than the first generation computers.
The third generation computers were made in the 1960's. They were much smaller, and cheaper than first and second generation of computers, also known as mainframes.
The forth generation of computers were made from 1971 till now.