A platinum catalyst is a substance that speeds up chemical reactions without being consumed in the process. It is made primarily from the metal platinum, which is known for its excellent ability to facilitate reactions, especially in industrial applications. Platinum catalysts are commonly used in processes like catalytic converters in vehicles, where they help convert harmful gases into less harmful emissions. These catalysts work by providing a surface for reactants to come together, lowering the energy needed for the reaction to occur. This makes reactions more efficient and can lead to significant energy savings. Their effectiveness and durability make platinum catalysts valuable in various chemical industries.