Kettle corn is typically sold at fairs, amusement parks, and carnivals and made in a large oiled cast iron pot. The kernels are cooked in hot oil until they pop, then tossed in salt and sugar for a unique sweet and salty flavor. Popcorn, on the other hand, is typically air-popped or cooked in oil, and then tossed with melted butter and salt for a savory flavor.