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    SIZE, SPEED, PROCESSING AND COST

                      On the basis of size, speed, processing and cost, computers can be categorised as follows:

                      Microcomputers
                      Microcomputers were earlier termed personal computers. A personal computer consists
                      of a CPU, computer memory (primary and secondary), input and output devices. There

                      are various microcomputers available nowadays. Let us discuss about them.
                      Desktop Computer

                      A desktop  is primarily used  in offices  and in homes.  It is
                      designed to fit comfortably on a desk.

                                              Laptop

                                              A laptop is a portable computer that you can keep on your lap. You

                                              can carry a laptop anywhere; therefore, you are not restricted to
                                              one place as you are while working on a desktop.

                      Tablet

                      A tablet is a kind of microcomputer that offers new features to the

                      IT-savvy world like a touchscreen. It is available in a variety of sizes
                      and has an in-built virtual keyboard and a battery.

                                  Smartphone
                                  It is a mobile phone built on a mobile operating system. It provides additional

                                  features  for day-to-day  tasks  including  sending  emails  and  accessing  the
                                  Internet.

                      Minicomputers

                      Minicomputers are more powerful than microcomputers. They are
                      bigger in size and faster in processing speed. They can support several
                      users working at the same time on the same machine, which means
                      they support a multi-user environment. Some common examples are

                      HCL Magnum, VAX 7500, etc.

                                                   Mainframe Computer

                                                   A mainframe computer is a massive computer that occupies
                                                   a huge amount of space and often fills an entire room. It can

                                                   store an enormous amount of information and is designed for

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