20th century is the era of modern technology in which computer is the greatest invention and gift of scientists.  It is a wonderful gift for whole human beings. It has the capability to store large no of data in its memory. The inventor of first computer was Charles Babbage who invented a mechanical computer. Computer is a high leap forward in the field of science. A computer is an electronic brain which can perform many tasks together. It is a versatile device which can compute and interpret information very quickly. The use of computer is very friendly. Everybody can handle it easily and learn it in less time. Computer can do any type of work.