So to see what we mean, let's take a look at the following energy diagram. So, let's suppose we have a hypothetical elementary single step reaction in which the reactants are these and the products are these. So on the reactant side, we have a bond between A and B, and C exist by itself. On the product side, we now have a bond between B and C, and A exist by itself. Now, based on the following energy diagram so the y axis is the Gibbs free energy and the x axis is the reaction progress. So we go from reactants to products.