I would really appreciate if someone could tell me all about bar code labels and readers/scanners!?

I would really appreciate if someone could tell me all about bar code labels and readers/scanners!?
I have an offer of a job selling these and I need material to study the technology and products.
I thank all who answer before hand.

Best answer:

Actually, the lines represents numbers, the first part tells about the manufacture, and the other half tells you about the product. A special scanner called wand is used to read them, and the software deciphers them ito useful data about that particular product. You should go further to understand the details.

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