Certified GKH Gardening Expert
Most corn you see for sale in your local big box store will by hybrid. Most seeds sold commercially (corn or otherwise) are hybrid seeds, as hybrids are bred to be more disease resistant and do not reproduce true (which means the seed seller has a guaranteed repeat customer).
In today's world, if the seed you buy is not marked "heirloom" it is a hybrid seed. Here is more information on hybrid seeds: https://www.gardeningknowhow.com/garden-how-to/seeds/non-hybrid-seeds-vs-hybrid-seeds.htm