introduction about computer

Introduction of computer:-    A computer is an electronic device. A computer is a man-made electronic device which reads, stores and processes data to produce meaningful information as output. it is made of English word 'to compute'. it operates under the control of a set of instructions that is stored in its memory unit. 

A computer is a collection of hardware and software components that helps us to accomplish many different tasks. computer can not works on their own. They do what we want them to do, only we give them the right command . its memory is better than human memory.

                                             The generations of computers 

1. The first generation : 1946 to 1958:- The first generation 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.
3. The Third generation : 1965 to 1970 :- Integrated circuits (IC) are introduced 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.The Fifth generation: 1990 to present 

5.Fifth generation computing devices, based on artificial intelligence , are still development, there are some application ,such as voice recognition, that are being used today.