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    Laptop: It is a portable and small digital personal computer
                                                    that is suitable for use while travelling. We can use a laptop
                                                    computer by keeping it on our lap. A laptop computer has

                                                    a built-in mouse, monitor and a keyboard. It also has a
                              Laptop                rechargeable battery.

                          Tablet: It is a portable digital computer smaller than the
                         laptop computer. It has a touchscreen as its primary input

                         device instead of a mouse.
                      Minicomputer                                                                            Tablet

                      A minicomputer is a type of computer that is bigger, more
                      expensive and more powerful than a microcomputer. It can

                      contain one or more microprocessors as its processing unit.
                      A minicomputer has the capability to serve a number of users
                      simultaneously.

                      It is also known as small or midsize server computer. Some

                      common examples of  minicomputers are  PDP-11,  PDP-8
                                                                                                          Minicomputer
                      and HP-3000.
                       Clickipedia

                         A server is also a computer that provides data and other services  to other

                         computers. It is used in offices where many computers are connected with each
                         other.

                      Mainframe Computers

                      Mainframe  computers  are  very  large,

                      fast, powerful and more expensive than
                      minicomputers. They can have multiple
                      microprocessors as their processing unit.

                      Mainframe computers are generally used in

                      big organisations where large amounts of data
                      is used such as banks.  Examples of
                      mainframe computers are IBM zSeries, IBM                                Mainframe Computer

                      4381, ICL 39, etc.

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