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Barcode Reader: It uses a laser or camera to scan the barcode.
                                             These Barcodes are a series of vertical lines or patterns that represent
                                             data such as product details, prices, or identification numbers. Barcode
                                             readers are commonly used in stores, warehouses, libraries, and more.
                                             People at the counter in the shopping malls use barcode readers to
                     scan product barcodes and then generate the bill.

                     Scanner: It is  an input device that is  used to convert  physical
                     documents, photos, or objects into digital form so that they can be
                     stored and processed on a computer. It captures images or text from
                     paper and turns them into digital files.
                  Processing Device
                  The Central Processing Unit (CPU) is often called the "brain" of the computer. It’s the part of the
                  computer that carries out most of the instructions, does the calculations, and makes sure that
                  everything runs smoothly.

                  Main parts of a CPU are as follows:
                  a.   Control Unit (CU): It tells other parts of the computer what to do. It controls the flow of data
                     and ensures everything works together.
                  b.   Arithmetic Logic Unit (ALU): It performs calculations and logical operations like adding
                     numbers or comparing data.

                  c.   Memory Unit (MU): It stores temporary information that the CPU might need while working.
                     It acts like a small storage area inside the CPU.
                  Output Devices
                  Output devices are used to display output processed by the computer. When you use a computer,
                  you might want to see a picture, listen to music, or print a document. Output devices help you
                  achieve all this. Some of the commonly used output devices are as follows:

                                       Monitor (Visual Display Unit): It is the main output  device of the
                                       computer.  When you  use a  computer,  it processes data  and  sends that
                                       information to the monitor. The monitor then displays this information in
                                       the form of text, images, and videos, allowing you to see what the computer
                                       is doing.
                     Printer: It is an output device that makes an exact copy of what you see
                     on the screen on the paper. This copy is also known as hardcopy. There are
                     different types of printers available in the market such as Inkjet, Laser and
                     Dot matrix printers.
                                          Plotter: It is a special type of printer used to create large and detailed
                                         images, drawings, and graphics on paper. It uses a pen or a series of pens
                                         to draw continuous lines. This feature helps in getting a precise image on
                                         the paper.

                     Speaker: A speaker is an output device that produces sounds from videos, or
                     any other audio content played through your computer or device.




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