What is a bar code? Why is a bar code reader used?

Q. What is a bar code? Why is a bar code reader used?

Answer :-

Bar Code Reader: A bar code is a collection or a sequence of lines of different heights and widths that are printed on various types of products. The machine that reads these bar codes is called a bar code reader.

It consists of a light source, a lens and a light sensor which translates optical impulses into electrical signals. Also, it contains decoder circuitry which analyses the bar code's image data and sends the bar code's content to the scanner's output port.