A catalyst is a substance that speeds up a chemical reaction without being consumed in the process. Think of it as a helper that makes things happen faster. For example, in the production of ammonia, a catalyst allows the reaction to occur at lower temperatures and pressures, saving energy and resources. Catalysts are essential in many industries, including pharmaceuticals and petrochemicals. They help create products more efficiently and reduce waste. By lowering the energy needed for reactions, catalysts also contribute to more environmentally friendly processes, making them vital for sustainable development and innovation in chemistry.