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POP is a Proof of Purchase, which is also known as a UPC. Each company calls it something different, even though they usually mean the same thing. Although, it sometimes means other things too. For instance, a while back, Pop Secret was doing this huge promotion for free boxes of their popcorn with POP. The POP wasn't the UPC this time, instead it was called a Kernel Point, and it was located on one of the smaller flaps that you use to close the box. Usually manufacturers do this for their big promotions, and they don't want people using the UPCs that they've been saving, but going out and buying the product new, with the POP on it.