Computer has indeed been defined as an electronics device that store, retrieve and process data. The origin of the computer could be traced back to the days when abacus was indeed the major equipment used in the calculation which was further worked - which led to the invention of the logarithms. With the meaning and definition of computer clearly stated, I will love to proceed by literary taking you through a tour as to the origin of how computer originated and the various types of computer that was invented in the past and how these inventions were used in the past.