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•  Audio Port: This port connects external audio devices such as speakers,
                                          headphones, and microphones to the computer.



                  •  Ethernet Port: This port connects the network cable to the computer, providing
                     Internet and network access.


                                         Sound Card

                                         A sound card is a hardware part of the computer system. It is located
                                         inside the CPU box and is used to convert the sound into digital data and
                                         vice-versa. It allows a computer to play music with the help of an output
                  device like a speaker. A sound card has audio ports through which we can connect the speakers
                  and headphones to the computer.

                  Video Card

                  A Video card, also known as a graphic card. It is used to convert digital
                  data into video form and vice-versa. After converting the digital data into
                  video, it displays the output on the display devices like monitors and TVs.
                  A video card is also used to improve the quality of the pictures and videos.
                  It has processing as well as storage capability.

                  External Hardware Components

                  The hardware  components located  outside the CPU box are  called  External  Hardware
                  Components. As these components are connected to the computer externally, they are also
                  called  Peripheral Components.  External  hardware  components  can  be  classified  into  three
                  categories:


                                                  External Hardware Components





                         Input Devices          Output Devices         Storage Devices         Hybrid Devices


                  Let us discuss these in detail.
                  Input Devices


                  A computer accepts data and instructions from you through input devices. Data can be in the
                  form of numbers, text, sound, or graphics.
                  Some of the input devices are:
                                                  •     Keyboard: It is a standard input device. It is mainly used to
                                                      type text and to send the instructions to a computer with the
                                                      help of keys. Keyboard keys are the buttons that represent
                                                      alphabets, numerics, alphanumerics and special characters.




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                         iPlus (Ver. 2.1)-VII
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