Glycolysis is the process by which we transform glucose into pyruvate molecules and other types of molecules such as ATP, NADH, water and H plus ions. Now, glycolysis takes place in the cytosol of the cell, in the fluid portion of the cytoplasm of the cell. And glycolysis is an anaerobic process, which means it takes place in the presence or in the absence of oxygen. So for one glucose that basically is broken down in glycolysis, we produce two pyruvate molecules, as shown in this region. Now, once these pyruvates are formed, they are present in the cytosol. And if we have oxygen present in the cell, the cell can basically undergo a process known as cellular respiration.