4. What is a UPC barcode?

Barcodes on packaged foods are an example of the UPC-A code format. It is 12 digits long and looks something like this:

1D barcode example for GreatLakesBarcode.com with explanation of UPC, company profix and item reference.

The UPC number itself is referred to as the GTIN (Global Trade Item Number). The GTIN is made up of two parts: The UPC Company Prefix and the number that you have assigned to that unique product.