Computer is a household name today. It is no longer a device to be used only by highly qualified people like Engineers and Scientists. It is a very popular today with all kinds of people from Businesspersons to employees from Engineers and Scientists to School going Students. Today in schools and colleges, computers are introduced as one of the subjects in regular curriculum. The development of other areas of scientific, technical and general interest; computer science, its recognition and appreciation has grown up to a very fast pace. It has become a necessity tool in the day to day life of human beings. Computer Knowledge is more important for Trainee Teachers in the modern world for effective teaching and learning. Computer is a tool for development.