There are two types of popcorn kernels - butterfly and mushroom. The butterfly popcorn kernel is usually large, light, and fluffy, and it looks like it has wings, much like a butterfly. Its tenderness depends on the size of kernel. The mushroom type of kernel is more dense and compact, like a ball. It is used for candy coating, caramelizing, etc. It does not have wings that would break off during handling or cooking processes. There are varying percentages of mushroom kernels in this variety, depending on how it is going to be used.