Demystifying Barcodes

I never really understood how barcodes worked before. Not that I really do now, not the technical aspect of it. But for one of my projects at work, I have to make barcode cover sheets, and it is very easy. We also make some barcodes for some of our products. We can do some work with barcodes, but not all. I know that people with POS systems may have more understanding of how to work with barcodes. We may have to get one of those systems. All I know is that the mystery has been lifted a little bit for me!