What happens during the pathway of glycolysis?

During glycolysis, one molecule of glucose (6 carbon atoms) is broken down into two molecules of pyruvate (3 carbon atoms each) through a series of ten enzyme-catalyzed reactions. The pathway includes an energy investment phase where two ATP molecules are used, followed by an energy generation phase where four ATP molecules and two NADH molecules are produced. The net result is a gain of two ATP molecules.