The German auto company AUDI is a four-letter word and is one of the most well-known luxury car brands in the world. It was founded in 1909 by August Horch and has since become a leader in the automotive industry. The other German auto company, Opel, is also a four-letter word. Founded in 1862, it is now a subsidiary of General Motors and produces a wide range of vehicles, from small city cars to large SUVs. Both AUDI and Opel are renowned for their quality and innovation, making them two of the most popular German auto companies.