Initial Product of Glycolysis

In the study of bioenergetics, understanding the fundamental concepts of energy transformations is essential. One of the most important processes in cellular metabolism is the conversion of glucose into ATP, which is the energy currency of the cell. During this process, glucose is broken down through a series of chemical reactions. These reactions commence with the presence of an enzyme-catalyzed reaction that produces an important energy-rich molecule from glucose. What is the initial product formed from the breakdown of glucose in glycolysis?