Having been around for a few years (a lady never tells you her age) and not living in a cave. I have to admit that barcodes are everywhere and not just on the food you buy in the supermarket (although that’s the place you usually notice them).
Putting a barcode on an item means it can easily be tracked and counted. Usually this is part of an automation process. The automation bit ensures that the data from the barcode is captured quickly and accurately allowing a business to be more efficient.