Popcorn is a healthy and popular snack. Although there are a number of flavors available, the original popcorn kernels are the best for your health. Popcorn, or pop-corn, is a variety of corn kernel, which expands and puffs up when heated. A popcorn kernel strong hull contains the seed hard, starchy endosperm with 14-20 % moisture, which turns to steam as the kernel is heated. The best thing about this snack is that it is absolutely oil-free and is easy to make.