Audi has an interesting heritage. It started out as a company founded by August Horch, named Horch, which means "hark" in German. After a name dispute, the company then split into both Horch and Audi, which means "hark" in Latin. In 1932 Audi, Horch, DKW, and Wanderer merged to create Auto Union. The four rings of today's Audi logo are taken from the Auto Unions logo, with each of the rings standing for one of the manufacturers. Eventually, Volkswagen got its hands on Auto Union and brought back the Audi name. Through the years, there have been some great Audis, Horches, DKWs, Wanderers, and Auto Unions, and we've compiled a list of the top 25.
Note: "Ur" is a German prefix meaning "ancestral," and Audi fans use this to denote the first of a line. The Ur-Quattro was the first Quattro, for example.