What Are The Merits & Demerits Of Computer?

What are the merits & demerits of market targeting of heavy users of a product

MERITS:
A computer has many advantages, But mostly computers have been source of income to an individual,companies, and even to a country. A good example is Mr Microsoft Windows, know well as Bill Gates. He is the made the operating system know as microsoft Windows. It is through microsoft window a computer can start to work properly. It is stored in CD's and being sold all over the world. Countries with companies that manufactures computer,their economy is contributed also by those computer making companies. Mr Bill Gates is one of the richest men in the world and he has achieved it all thanks to Computer making companies he has and the beautifully creation of Microsoft windows.
DEMERITS:
Computer as computer has also many demerits individually and in the society. Computer can destroy the culture of a certain group of people in the society, especially youths. Many of the youth uses internet computers to watch destructive programmes stored in the computer. Also some People can use computer for a long time, without procution people can suffer eyes problem.Safety procution are explain in later in this project. All in all if a computer is use purposefully, A computer is one of the usefuly machines that a man has made.