Barcodes are those parallel lines and numbers we see printed at the back of items sold in stores. These numbers and lines, when read, gives information about a product, like its price and description.
These barcodes are read by the use of a barcode scanner. There are different kinds of barcode scanners. The cheapest is the contact wand and the most expensive is the laser scanner. Last night, I downloaded a scanner from my android phone. The feature enables me to compare prices of items and to see which ones are cheaper. The wonders of technology.