UPC barcode, where UPC stands for Universal Product Code is a specific type of barcode. Its main purpose is to provide a simple identification number for a product. There are few versions of the UPC code but the most famous and generally preferred is the UPC-A. It adopts a pattern of black bars and white spaces where a total of 12 numeric digits can be encoded. Each figure is represented by a combination of two bars and two spaces whose width varies from 1 to 4 modules. A simple of an UPC code is the following: SLLLLLLMRRRRRRE where the Ls and the Rs represent two separate groups of six digits each. The S (Start), and the E (End) blocks are based on the principle bar-space-bar (3 modules) and the M (Middle) - space-bar-space-bar-space (5 modules).
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