Science has discovered many wonders and computer is one of them. Computer was not invented over night. It takes long time and hard labor to invent the computer. First of all Pascal invented the theory of “Digital calculating system” in 1642.Though his attempts ware not crowned with success, he initiated the research which paved the way to the invention of computer. Finally Mr. Haward Sums after seven years electric computer was used in Harvaed University in 1944. After that many other computers have been invented such As EDSAC an 1945 and ENTACE in 1946 etc.
A computer consists of five major components. They are the input Unit, the output unit, the memory unit, the control unit the arithmetic unit. Computer is of great use to us. It renders great service to mankind. It has lessened our work loads and makes our life easy and comfortable. It is used in all spheres of our life like education, medical science, agriculture, commerce, printing, industrial sector etc.