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.
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