Synopsis India has made tremendous progress in the field of Information Technology and Computer has become a most powerful tool in the human hands for storing data and retrieving information. Undoubtedly, Computer technology has proved its importance. Due to its enormous capabilities, computer is playing a major role in every field such as in space research, in defense, industries ad many more. Computer is a popular machine now a days. Popularity of computers gave rise to its different types, such as analong, digital an hybrid computers based on their working or home computers, PC’s based on their size and speed and super computers. This book as a handy reference book and will go a long way in explaining all aspects of computer education and training programs.