Automotive catalysts are devices used in vehicles to reduce harmful emissions produced during combustion. They contain precious metals like platinum, palladium, and rhodium, which help convert toxic gases such as carbon monoxide, nitrogen oxides, and unburned hydrocarbons into less harmful substances like carbon dioxide and nitrogen. These catalysts are typically found in the exhaust system of cars and work by facilitating chemical reactions at high temperatures. By improving air quality and meeting environmental regulations, automotive catalysts play a crucial role in making vehicles more eco-friendly and efficient.