Homogeneous catalysts are substances that speed up chemical reactions while being in the same phase, or state, as the reactants. Typically, these catalysts are dissolved in the same solvent as the reactants, allowing for better interaction and efficiency. This type of catalysis is often used in organic reactions, where the catalyst can facilitate the transformation of molecules without being consumed in the process. One common example of a homogeneous catalyst is acid, which can help in reactions like esterification. In these reactions, the catalyst provides an alternative pathway with a lower activation energy, making it easier for the reactants to convert into products.