We are living in the era of computer fulfilling our daily and routine activities. Evolution of computer has a rich history on his back and hundreds of years of hard work. Using of computer is increasing day by day. In the start computer was a calculating machine. With the passage of time, due to drastic development in the computer made the revolutionary invention of the century. Computer development took hundreds of years and still there is no end.
A computer accepts information using an input devices. The information is processed by a central processing unit or stored in a storage unit i.e. Hard Disk and then processed. The result is supplied by an output devices. If the input and output units are connected to a manufacturing process, the computer can control the process and the system is called a computing system.
The evolution of computer development is connected to the various computer generation. All the five generations of computer have distinct technological development, unique characteristics and advantages and disadvantages. Every development bring computers to compact size, powerful, efficient and cheaper.