Popcorn is made of maize. Maize, a type of corn, increases in size from the kernel and takes on a puffy appearance when it comes in contact with high heat.
The maize that is used to make popcorn is primarily grown in the cornbelt region of the United States. This includes the states of Iowa, Michigan, Missouri, Kansas and Ohio. Maize is similar to corn on the cob in appearance, but only popcorn kernels are able to expand and pop. Popcorn must be harvested and dried before it is ready to pop. The kernels must reach between 400 and 460 degrees Fahrenheit to pop. Popcorn can be seasoned with both sweet and savory ingredients.