The Word quotComputerquot comes from the word quotcomputequot, which means quotto calculatequot. Hence, people usually consider a computer to be a calculating device that can perform arthmetic operation at high speed. In fact, the original objective for inventing a computer was to create a fast calculating machine. However, more than 80 of work done by computers today is of non-mathematical or non numerical nature.Hence, to define a computer merely as a calculating device is to ignore over 80 of its function.