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Popcorn kernels aren't 'made', they are grown. Popcorn is simply a sort of flint corn that has a thick and tough shell or hull on the kernels. When the kernels are mostly dried (they contain 15–20% moisture) and they are heated, the hearts of the kernels produce steam and the hull prevents the steam from escaping.As heat is applied to the dried kernels, the droplet of water converts to steam, and pressure begins to build. Once the hull can no longer hold the pressure of the steam, the kernel explodes. The starch inside the kernel turns into the white fluffy, crunchy stuff we call popcorn.