The Audi A4 is a line of luxury compact executive cars produced since 1994 by the German car manufacturer Audi, a subsidiary of the Volkswagen Group. The A4 has been built in five generations and is based on the Volkswagen Group B platform. The first generation A4 succeeded the Audi 80. The automaker's internal numbering treats the A4 as a continuation of the Audi 80 lineage, with the initial A4 designated as the B5-series, followed by the B6, B7, B8, and the B9.

The Audi A5 is a series of compact executive / grand touring coupé cars produced by the German automobile manufacturer Audi since June 2007. The A5 range additionally comprises the coupe, cabriolet, and "Sportback" version of the Audi A4 saloon and estate models.