And glycolysis is the process by which the glucose molecules present in a cytoplasm are broken down into Pyruvate molecules. So two Pyruvate molecules are net result of two ATP molecules which can be used by the cell to carry out some type of process as well as NADH molecules. And we'll discuss what those are in a future lecture. But ultimately, glycolysis produces these byproduct molecules we call pyruvates. Now, glycolysis is an anaerobic process and what that means is it does not require oxygen to actually take place. So whether or not we have oxygen doesn't actually matter because glycolysis doesn't actually use oxygen.