Audi is a well-known car developer and manufacturer with four rings. Now a subsidiary of Volkswagen AG, headquartered in Ingolstadt, Germany, Audi is one of the oldest car manufacturers in Germany. Since 1932, Audi has adopted the four-ring logo, which symbolizes the merger of Audi and the Little Wonder (DKW), Horch and Wanderer. In the 1930s, the Auto Union Company covered all the passenger vehicle sectors that the German automotive industry could offer, from motorcycles to luxury cars. This shows that Audi's history was divided into two parts by World War II. The first part is the automobile alliance before World War II, and the second part is the development of Audi after World War II.