Classic popcorn is mostly popped with oil and butter, while kettle popcorn is traditionally air-popped in an iron kettle. Regular popcorn is considered a healthy snack. While kettle popcorn has similar health benefits, you should watch the sugar.

Kettle corn gets its name from its preferred method of preparation, which is in a cast-iron kettle. Another key difference is kettle corn's use of sugar. Along with oil and salt, sugar is added to the kettle and requires constant stirring to avoid burning the sugar. A little bit more work for a little sweeter treat!

According to experts, the average profit margin for kettle corn is between 50 and 60 percent. This means that for every $1 of kettle corn sold, the vendor can expect to make between 50 and 60 cents in profit. Typically vendors can make much more than this.

While both caramel corn and kettle corn are sweet, caramel corn is richer in flavor and texture. Historically sweetened with molasses, caramel corn is most-often candy-coated. The thin, crunchy, sweet coating is derived from melted sugar.