Converter (noun)

1. A device or substance that changes one thing into another, especially electricity into heat or a gas into liquid.
2. A person or thing that causes someone or something to change their beliefs, attitudes, or course of action.

Origin:

Mid 19th century: from convert, on the pattern of diverter.

Examples:

1. The converter changed the DC power into AC power.
2. An catalytic converter is used to reduce pollutants in car exhaust.
3. He was a converter of non-believers.
4. The software can serve as a file format converter.
5. The converter was used to change the raw materials into finished products.