It has its own specific purpose, it carries out a specific function. So let's begin with stage one. In stage one, the entire point of stage one is to take that glucose molecule, trap that glucose molecule inside a cell so that it can't actually leave that cell, and begin preparing that glucose molecule for cleavage, which takes place in stage two. So the entire point of stage one is to prepare that molecule for stage two where it basically is cleaved into two identical three carbon molecules. And once it is cleaved in stage two, it's the third stage where we harvest some of that energy, we capture some of that energy to form ATP molecules, as we'll see in just a moment. So as we discuss each one of these individual processes, keep that in mind because ultimately, for instance, in stage one, each one of these reactions takes place and each one of these reactions essentially wants to accomplish that end goal.