Describe the role of a catalytic converter.

A catalytic converter plays a crucial role in reducing harmful emissions from an engine's exhaust system. Its primary function is to convert harmful pollutants such as carbon monoxide, nitrogen oxides, and hydrocarbons into less harmful substances like carbon dioxide and nitrogen. This chemical reaction occurs within the catalyst, which is typically made up of precious metals, enabling the transformation of these pollutants into gases that are much less harmful to the environment.

By facilitating this conversion, the catalytic converter ensures that vehicles comply with environmental regulations and contribute to cleaner air. This role is fundamental in promoting sustainability and reducing the impact of automotive emissions on public health and the environment. The other options do not accurately reflect the purpose of a catalytic converter. While it may indirectly affect engine performance by ensuring optimal combustion, it does not increase engine power, cool the engine, or lubricate engine components.