A computer can be easily defined as a programmable device which can store, retrieve and process data. In the present age of information they have become an integral part of our lives. The first computer was invented back in 1960's by Konrad Zuse. It was of the size of a huge room and required large amounts of power. At that time it was a very valuable device for the world. However with the passage of time there has been a lot of progress in technology and the present computer devices are much more advanced as compared to the original version. Today the computers are widely used in every sphere of life. Be it education, home or office the usage of computers will be found everywhere.

There has been so much advancement in technology that the computer has been introduced even in its mobile form. The laptop computer is a small mobile computer weighing upto 6 kilograms. Laptops usually run on battery or AC/DC adapter. Laptops are capable of executing the same tasks as a desktop computer. They also contain the same components as the desktop computers but in a miniaturized and optimized size for its mobile usage.
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