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UPC (Universal Product Code) is used primarily in the retail industry as a
POS (point of sales) barcode symbology.
UPC is used in the United States and Canada in the
retail industry to uniquely identify a product and it`s manufacturer
so that cash register systems can automatically look up the
related data. There are two types of UPC codes UPC-A and UPC-E. UPC-E
The UPC-E a variation of the UPC-A. UPCE also a numeric barcode consisting of eight digits. It is used to identify products with small packaging. In addition to the requirement that the first digit of the barcode (number system) must be zero, there are four rules that determine what UPC codes can be printed using the compressed UPC-E format: Like the UPC-A the UPC-E also has two versions, one can be augmented with a 2 digit supplement and the other with a 5 digit supplement to the right of the barcode to increase the amount of information encoded. UPC-A with 2 digit supplement 
UPC-A with 5 digit supplement 
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